Openconnect VPN for Discoverer HPC does not install on ubuntu 24.04

[amanb1901]

Following the instructions at:

https://docs.discoverer.bg/vpn.html

gives the following error:

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libtss2-mu-4.0.1-0t64 : Conflicts: libtss2-mu0 but 3.2.0-1ubuntu1.1 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

[amanb1901]

Use

sudo apt install libtss2-mu0=3.2.0-1ubuntu1.1

to force install the required libtss2 version

[VatsalSy]

There are additional steps to solve this issue.

• Edit /etc/apt/sources.list.d/ubuntu.sources and replace noble with jammy at two instances:
  Suites: jammy noble-updates noble-backports (instead of Suites: noble noble-updates noble-backports)
  and Suites: jammy-security instead of Suites: noble-security. The file should read like:
  

This comment was provided at: bambulab/BambuStudio#3973

• do

sudo apt-get update 

and

sudo apt-get upgrade

• then remove mailcap using:

sudo apt autoremove 

• force install the dependency using

sudo apt install libtss2-mu0=3.2.0-1ubuntu1.1

• Lastly, install openvpn using

sudo apt-get install globalprotect-openconnect

[amanb1901]

Replacing noble with jammy might result in lots of broken dependencies. For me it was with python3. In that case, switching them back after installing the vpn worked.