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I'm trying to update Xubuntu 22.04 LTS to 24.04 LTS on my headless server without success.

What I've tried:

  • I installed update-manager to be able to upgrade to 24.04 (as stated on the Xubuntu website) using Remmina / XRDP. However, when executing update-manager -c -d, I do get a message telling me that there's a newer version of Xubuntu, but when clicking "Update...", I'm being thrown out the application with an error message that says Error executing command as another user: Not authorized despite having typed my sudo password after application start.
  • When executing sudo update-manager -c -d, I'm getting a warning Gtk-WARNING: cannot open display: :10.0 and the application exits.

So I tried a pure-cli approach:

  • sudo apt update && sudo apt -y upgrade && sudo apt -y dist-upgrade
  • sudo vim /etc/update-manager/release-upgrades and set Prompt=lts
  • sudo do-release-upgrade will just tell me that there's no development version of an LTS available.

What am I missing here? What am I doing wrong?

I've also posted this question on Server Fault, however without getting an answer.

Thanks in advance.

tai
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