I get this issue also on ubuntu 22.04 lts. I am running the “unity” desktop (no moonlight theme), and that may itself be the issue, as I can’t get VNC nor RDP to work either (for those I have performed the “keyring dance” which seemed to work ok). I tried the suggestion to install Zenity, but that had zero effect. If I didn’t dread the idea of setting back up all my RAID arrays, I would switch to Mint, and I may have to in the end. Does anyone know why this is occuring? Can I fix it by switching to xfce desktop?