The language service could not be started:

[ghost]

Issue: pwsh extension doesn't work because error "The language service could not be started", read all issues related (#1360, #1957, #1423, #340) and cannot solve the issue.

Log ("powershell.developer.editorServicesLogLevel": "Diagnostic"):

8/4/2019 8:59:11 PM [NORMAL] - Language server starting --
8/4/2019 8:59:11 PM [NORMAL] -     exe: /opt/powershell-6.2.2-linux-x64/pwsh
8/4/2019 8:59:11 PM [NORMAL] -     args: $HOME/.vscode/extensions/ms-vscode.powershell-2019.5.0/modules/PowerShellEditorServices/Start-EditorServices.ps1 -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2019.5.0' -AdditionalModules @('PowerShellEditorServices.VSCode') -BundledModulesPath '$HOME/.vscode/extensions/ms-vscode.powershell-2019.5.0/modules' -EnableConsoleRepl -LogLevel 'Diagnostic' -LogPath '$HOME/.vscode/extensions/ms-vscode.powershell-2019.5.0/logs/1564970351-698c045b-dcc0-4ef3-9b12-6d907b0819e31564969750767/EditorServices.log' -SessionDetailsPath '$HOME/.vscode/extensions/ms-vscode.powershell-2019.5.0/sessions/PSES-VSCode-11353-672612' -FeatureFlags @()
8/4/2019 8:59:11 PM [NORMAL] - powershell.exe terminated or terminal UI was closed
8/4/2019 8:59:11 PM [NORMAL] - powershell.exe started, pid: 11821
8/4/2019 9:01:11 PM [NORMAL] - Language server startup failed.
8/4/2019 9:01:11 PM [ERROR] - The language service could not be started: 
8/4/2019 9:01:11 PM [ERROR] - Timed out waiting for session file to appear.

VSCode Version: 1.36.1
OS Version: Linux x64 4.19.62-1-MANJARO
PowerShell Extension Version: v2019.5.0
PowerShell Version: Core 6.2.2 Linux x64
$PSVersionTable:

Name                           Value
----                           -----
PSVersion                      6.2.2
PSEdition                      Core
GitCommitId                    6.2.2
OS                             Linux 4.19.62-1-MANJARO #1 SMP PREEMPT Sun Jul 28 09:14:58 UTC 2019
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Notes:
1. VSCode Terminal shows error chdir(2) failed: No such file or Directory.
2. Custom settings:

"powershell.powerShellExePath": "/opt/powershell-6.2.2-linux-x64/pwsh",
"terminal.integrated.shell.linux": "/opt/powershell-6.2.2-linux-x64/pwsh",
"powershell.scriptAnalysis.enable": true 

3. $HOME/.vscode/extensions/ms-vscode.powershell-2019.5.0/modules has PowerShellEditorServices.psd1.
4. Import-Module $HOME/.vscode/extensions/ms-vscode.powershell-2019.5.0/modules/PowerShellEditorServices.psd1 and restart VSCode does't work.
5. pswh from terminal works well.

[ghost]

Deleting $HOME/.config/Code and $HOME/.vscode solved the issue.

[rjmholt]

This is a particular class of issue where VSCode unhelpfully gives no context when a configuration has become broken in some way. Similar errors occur when, for example, PowerShell updates and the configured path to it does not change.