installs nothing

[v1nce]

Ubuntu 14.04.5 LTS
monodevelop 4.0.12

I can see the dialog.
I got a message about trusting server
Do you want to temporarily trust this certificate in order to connect to the server at www.nuget.org?

I can search a package (opencvsharp) and sees informations about it.
But when I click on "Add" (called Ajouter in french) nothing occurs.
No progress bar. Nothing.
No message in the console where I launch monodevelop

[mrward]

Anything in the IDE log? The logs should be available from the Help menu.

[v1nce]

I tried with a smaller package (jQuery.UI)

The first time I got a time out in the message textbox of the dialog

(------- Installing...jQuery.UI.Combined 1.12.1 -------
Attempting to resolve dependency 'jQuery (≥ 1.12.4)'.
The request timed out
System.Net.WebException: The request timed out
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in :0
at System.Net.HttpWebRequest.GetResponse () [0x00000] in :0
at NuGet.RequestHelper.GetResponse (System.Func1 createRequest, System.Action1 prepareRequest, IProxyCache proxyCache, ICredentialCache credentialCache, ICredentialProvider credentialProvider) [0x00000] in :0
==============================)

I retried and now it looks ok

[v1nce]

I retried with nuget opencvsharp

logs say

Starting MonoDevelop
Chargement de Workbench
Initialisation de la fenêtre principale
ERROR [2016-09-21 23:55:25Z]: GLib-Critical: Source ID 50 was not found when attempting to remove it
Stack trace:
at GLib.Source.g_source_remove(UInt32 )
at GLib.Source.Remove(UInt32 tag)
at GLib.Timeout+TimeoutProxy.Dispose(Boolean disposing)
at GLib.Timeout+TimeoutProxy.Finalize()
... repeated n times with varying resource

then

WARNING [2016-09-21 23:41:42Z]: GLib-GObject-Warning: Attempt to add property __gtksharp_55_MonoDevelop_Ide_Gui_Components_ZoomableCellRendererPixbuf::image after class was initialised
Stack trace:
at GLib.Object.gtksharp_register_property(IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , IntPtr , Boolean , Boolean )
at GLib.Object.AddProperties(GType gtype, System.Type t)
at GLib.Object.RegisterGType(System.Type t)
at GLib.Object.LookupGType(System.Type t)
at GLib.Object.LookupGType()
at GLib.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.CellRendererPixbuf..ctor()
at MonoDevelop.Ide.Gui.Components.ZoomableCellRendererPixbuf..ctor()
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.SolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectSolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Codons.SolutionPadCodon.m__48()
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(IPadWindow container)
at MonoDevelop.Ide.Codons.PadCodon.InitializePadContent(IPadWindow window)
at MonoDevelop.Ide.Gui.DefaultWorkbench.CreatePadContent(Boolean force, MonoDevelop.Ide.Codons.PadCodon padCodon, MonoDevelop.Ide.Gui.PadWindow window, MonoDevelop.Components.Docking.DockItem item)
at MonoDevelop.Ide.Gui.DefaultWorkbench+c__AnonStorey42.<>m__40(System.Object , System.EventArgs )
at MonoDevelop.Components.Docking.DockItem.SetupContent(System.Object ob, System.EventArgs args)
at System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Widget.gtk_widget_show(IntPtr )
at Gtk.Widget.Show()
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockLayout.SizeAllocate(Rectangle rect)
at MonoDevelop.Components.Docking.DockContainer.OnSizeAllocated(Rectangle rect)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Components.Docking.DockFrame.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Ide.Gui.WorkbenchWindow.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at MonoDevelop.Ide.IdeApp.Run()
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelop.Ide.MonoDevelopOptions options)
at MonoDevelop.Ide.IdeStartup.Main(System.String[] args)
at MonoDevelop.Startup.MonoDevelopMain.Main(System.String[] args)
WARNING [2016-09-21 23:41:42Z]: GLib-GObject-Warning: Attempt to add property __gtksharp_55_MonoDevelop_Ide_Gui_Components_ZoomableCellRendererPixbuf::image-expander-open after class was initialised
Stack trace:
at GLib.Object.gtksharp_register_property(IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , IntPtr , Boolean , Boolean )
at GLib.Object.AddProperties(GType gtype, System.Type t)
at GLib.Object.RegisterGType(System.Type t)
at GLib.Object.LookupGType(System.Type t)
at GLib.Object.LookupGType()
at GLib.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.CellRendererPixbuf..ctor()
at MonoDevelop.Ide.Gui.Components.ZoomableCellRendererPixbuf..ctor()
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.SolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectSolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Codons.SolutionPadCodon.m__48()
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(IPadWindow container)
at MonoDevelop.Ide.Codons.PadCodon.InitializePadContent(IPadWindow window)
at MonoDevelop.Ide.Gui.DefaultWorkbench.CreatePadContent(Boolean force, MonoDevelop.Ide.Codons.PadCodon padCodon, MonoDevelop.Ide.Gui.PadWindow window, MonoDevelop.Components.Docking.DockItem item)
at MonoDevelop.Ide.Gui.DefaultWorkbench+c__AnonStorey42.<>m__40(System.Object , System.EventArgs )
at MonoDevelop.Components.Docking.DockItem.SetupContent(System.Object ob, System.EventArgs args)
at System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Widget.gtk_widget_show(IntPtr )
at Gtk.Widget.Show()
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockLayout.SizeAllocate(Rectangle rect)
at MonoDevelop.Components.Docking.DockContainer.OnSizeAllocated(Rectangle rect)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Components.Docking.DockFrame.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Ide.Gui.WorkbenchWindow.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at MonoDevelop.Ide.IdeApp.Run()
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelop.Ide.MonoDevelopOptions options)
at MonoDevelop.Ide.IdeStartup.Main(System.String[] args)
at MonoDevelop.Startup.MonoDevelopMain.Main(System.String[] args)
WARNING [2016-09-21 23:41:42Z]: GLib-GObject-Warning: Attempt to add property __gtksharp_55_MonoDevelop_Ide_Gui_Components_ZoomableCellRendererPixbuf::image-expander-closed after class was initialised
Stack trace:
at GLib.Object.gtksharp_register_property(IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , IntPtr , Boolean , Boolean )
at GLib.Object.AddProperties(GType gtype, System.Type t)
at GLib.Object.RegisterGType(System.Type t)
at GLib.Object.LookupGType(System.Type t)
at GLib.Object.LookupGType()
at GLib.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.CellRendererPixbuf..ctor()
at MonoDevelop.Ide.Gui.Components.ZoomableCellRendererPixbuf..ctor()
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.SolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectSolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Codons.SolutionPadCodon.m__48()
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(IPadWindow container)
at MonoDevelop.Ide.Codons.PadCodon.InitializePadContent(IPadWindow window)
at MonoDevelop.Ide.Gui.DefaultWorkbench.CreatePadContent(Boolean force, MonoDevelop.Ide.Codons.PadCodon padCodon, MonoDevelop.Ide.Gui.PadWindow window, MonoDevelop.Components.Docking.DockItem item)
at MonoDevelop.Ide.Gui.DefaultWorkbench+c__AnonStorey42.<>m__40(System.Object , System.EventArgs )
at MonoDevelop.Components.Docking.DockItem.SetupContent(System.Object ob, System.EventArgs args)
at System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Widget.gtk_widget_show(IntPtr )
at Gtk.Widget.Show()
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockLayout.SizeAllocate(Rectangle rect)
at MonoDevelop.Components.Docking.DockContainer.OnSizeAllocated(Rectangle rect)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Components.Docking.DockFrame.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Ide.Gui.WorkbenchWindow.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at MonoDevelop.Ide.IdeApp.Run()
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelop.Ide.MonoDevelopOptions options)
at MonoDevelop.Ide.IdeStartup.Main(System.String[] args)
at MonoDevelop.Startup.MonoDevelopMain.Main(System.String[] args)
WARNING [2016-09-21 23:41:42Z]: GLib-GObject-Warning: Attempt to add property __gtksharp_56_MonoDevelop_Ide_Gui_Components_ExtensibleTreeView+2bCustomCellRendererText::text-markup after class was initialised
Stack trace:
at GLib.Object.gtksharp_register_property(IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , IntPtr , Boolean , Boolean )
at GLib.Object.AddProperties(GType gtype, System.Type t)
at GLib.Object.RegisterGType(System.Type t)
at GLib.Object.LookupGType(System.Type t)
at GLib.Object.LookupGType()
at GLib.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.CellRendererText..ctor()
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView+CustomCellRendererText..ctor(MonoDevelop.Ide.Gui.Components.ExtensibleTreeView parent)
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.SolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectSolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Codons.SolutionPadCodon.m__48()
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(IPadWindow container)
at MonoDevelop.Ide.Codons.PadCodon.InitializePadContent(IPadWindow window)
at MonoDevelop.Ide.Gui.DefaultWorkbench.CreatePadContent(Boolean force, MonoDevelop.Ide.Codons.PadCodon padCodon, MonoDevelop.Ide.Gui.PadWindow window, MonoDevelop.Components.Docking.DockItem item)
at MonoDevelop.Ide.Gui.DefaultWorkbench+c__AnonStorey42.<>m__40(System.Object , System.EventArgs )
at MonoDevelop.Components.Docking.DockItem.SetupContent(System.Object ob, System.EventArgs args)
at System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Widget.gtk_widget_show(IntPtr )
at Gtk.Widget.Show()
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockLayout.SizeAllocate(Rectangle rect)
at MonoDevelop.Components.Docking.DockContainer.OnSizeAllocated(Rectangle rect)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Components.Docking.DockFrame.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Ide.Gui.WorkbenchWindow.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at MonoDevelop.Ide.IdeApp.Run()
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelop.Ide.MonoDevelopOptions options)
at MonoDevelop.Ide.IdeStartup.Main(System.String[] args)
at MonoDevelop.Startup.MonoDevelopMain.Main(System.String[] args)
WARNING [2016-09-21 23:41:42Z]: GLib-GObject-Warning: Attempt to add property __gtksharp_56_MonoDevelop_Ide_Gui_Components_ExtensibleTreeView+2bCustomCellRendererText::show-popup-button after class was initialised
Stack trace:
at GLib.Object.gtksharp_register_property(IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , IntPtr , Boolean , Boolean )
at GLib.Object.AddProperties(GType gtype, System.Type t)
at GLib.Object.RegisterGType(System.Type t)
at GLib.Object.LookupGType(System.Type t)
at GLib.Object.LookupGType()
at GLib.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.Object.CreateNativeObject(System.String[] names, GLib.Value[] vals)
at Gtk.CellRendererText..ctor()
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView+CustomCellRendererText..ctor(MonoDevelop.Ide.Gui.Components.ExtensibleTreeView parent)
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.SolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectSolutionPad.Initialize(MonoDevelop.Ide.Gui.Components.NodeBuilder[] builders, MonoDevelop.Ide.Gui.Components.TreePadOption[] options, System.String contextMenuPath)
at MonoDevelop.Ide.Codons.SolutionPadCodon.m__48()
at MonoDevelop.Ide.Gui.Pads.TreeViewPad.Initialize(IPadWindow container)
at MonoDevelop.Ide.Codons.PadCodon.InitializePadContent(IPadWindow window)
at MonoDevelop.Ide.Gui.DefaultWorkbench.CreatePadContent(Boolean force, MonoDevelop.Ide.Codons.PadCodon padCodon, MonoDevelop.Ide.Gui.PadWindow window, MonoDevelop.Components.Docking.DockItem item)
at MonoDevelop.Ide.Gui.DefaultWorkbench+c__AnonStorey42.<>m__40(System.Object , System.EventArgs )
at MonoDevelop.Components.Docking.DockItem.SetupContent(System.Object ob, System.EventArgs args)
at System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Widget.gtk_widget_show(IntPtr )
at Gtk.Widget.Show()
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockGroup.SizeAllocate(Rectangle newAlloc)
at MonoDevelop.Components.Docking.DockLayout.SizeAllocate(Rectangle rect)
at MonoDevelop.Components.Docking.DockContainer.OnSizeAllocated(Rectangle rect)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Components.Docking.DockFrame.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Widget.gtksharp_widget_base_size_allocate(IntPtr , IntPtr )
at Gtk.Widget.OnSizeAllocated(Rectangle allocation)
at MonoDevelop.Ide.Gui.WorkbenchWindow.OnSizeAllocated(Rectangle allocation)
at Gtk.Widget.sizeallocated_cb(IntPtr widget, IntPtr allocation)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at MonoDevelop.Ide.IdeApp.Run()
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelop.Ide.MonoDevelopOptions options)
at MonoDevelop.Ide.IdeStartup.Main(System.String[] args)
at MonoDevelop.Startup.MonoDevelopMain.Main(System.String[] args)

then it complained again with source N not foud

then

ERROR [2016-09-21 23:55:15Z]: GLib-Critical: Source ID 11228 was not found when attempting to remove it
Stack trace:
at Gtk.TreeStore.gtk_tree_store_remove(IntPtr , IntPtr )
at Gtk.TreeStore.Remove(TreeIter ByRef iter)
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.RemoveChildren(TreeIter it)
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.RemoveChildren(TreeIter it)
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView+TreeBuilder.Remove()
at MonoDevelop.Ide.Gui.Components.ExtensibleTreeView.RemoveChild(System.Object nodeObject)
at MonoDevelop.Ide.Gui.Pads.SolutionPad.OnCloseWorkspace(System.Object sender, MonoDevelop.Projects.WorkspaceItemEventArgs e)
at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectSolutionPad.OnCloseWorkspace(System.Object sender, MonoDevelop.Projects.WorkspaceItemEventArgs e)
at MonoDevelop.Ide.RootWorkspace.NotifyItemRemovedGui(MonoDevelop.Projects.WorkspaceItem item, Boolean reloading)
at MonoDevelop.Ide.RootWorkspace.NotifyItemRemoved(MonoDevelop.Projects.WorkspaceItem item)
at MonoDevelop.Ide.RootWorkspaceItemCollection.RemoveItem(Int32 index)
at System.Collections.ObjectModel.Collection`1[[MonoDevelop.Projects.WorkspaceItem, MonoDevelop.Core, Version=2.6.0.0, Culture=neutral, PublicKeyToken=null]].Remove(MonoDevelop.Projects.WorkspaceItem item)
at MonoDevelop.Ide.RootWorkspace.Close(Boolean saveWorkspacePreferencies, Boolean closeProjectFiles)
at MonoDevelop.Ide.Gui.DefaultWorkbench.Close()
at MonoDevelop.Ide.Gui.DefaultWorkbench.OnClosing(System.Object o, Gtk.DeleteEventArgs e)
at System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at MonoDevelop.Ide.IdeApp.Run()
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelop.Ide.MonoDevelopOptions options)
at MonoDevelop.Ide.IdeStartup.Main(System.String[] args)
at MonoDevelop.Startup.MonoDevelopMain.Main(System.String[] args)

then it complained again with source N not foud

[mrward]

Those errors seem unrelated and should not affect the NuGet addin from working.

[v1nce]

I think I got it.

I got a first confirm dialog that pops UP when accessing the repository

Untrusted HTTP certificate detected
Do you want to temporarily trust this certificate in order to connect to the server at www.nuget.org?

then when I click Add

There's a second dialog that pops UNDER the addin modal dialog.

The problem is this dialog is hidden by the addin modal dialog and there's no way to select it.
You can't select it using alt tab or any window manager trick.

PS:
It looks like I lost it.
Now I can't reproduce it anymore. The button is now called "manage" and not "ajouter" ("add") and the popupunder doesn't ask for certificate confirmation it asks about in which projects I wish to install the nuget

PS2:
I created a new project. The button is called "ajouter" [add] again. I tried with "respond js". The windows was probably hidden again. After some time I got a (system ?) message about application not responding that offer to qui or continue. I continue and then the windows came in the foreground asking

Untrusted HTTP certificate detected
Do you want to temporarily trust this certificate in order to connect to the server at www.nuget.org?

after that I got a dialog to confirm the licence.

[mrward]

The dialog will show a Manage button if you opened it for the solution instead of the project.

The dialog about trusting the certificates is provided by MonoDevelop not the NuGet addin.

I would try trusting the certificates in Mono by running the following:

mozroots --sync --import

This should get rid of that dialog.