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I upgraded from bionic to focal today. Since then whenever a visual element is dismissed, it hangs around in slightly transparent form until the next event. This even applies to text in the terminal!

I apologize for taking a photo of the screen, but taking a screenshot is one of the actions which removes the ghost images.

enter image description here

This is the effect of switching away from top in screen to a new screen.

This isn't stopping me working; it's just weird. I'd like it to stop. I'm running a pretty standard GNOME Ubuntu desktop, with gnome-shell as the window manager.

karel
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Marnanel Thurman
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  • Are you using Wayland? Do you have Nvidia graphics? – Enterprise Feb 20 '21 at 01:09
  • Perhaps check and experiment with your preferences in the terminal. It looks like an issue with transparency to me. – vanadium Feb 20 '21 at 11:35
  • taking a screenshot is one of the actions which removes the ghosts - this suggests to me that the problem has to do with your display hardware, and not anything in the software or OS. – Nmath Feb 20 '21 at 21:19
  • @PJSingh yes, Wayland. How do I find out whether I have Nvidia graphics? – Marnanel Thurman Feb 21 '21 at 17:42
  • @vanadium it's not just in the terminal, though-- it's system menus and everything. – Marnanel Thurman Feb 21 '21 at 17:42
  • @Nmath fair enough, but then why would the problem appear only on a dist-upgrade? – Marnanel Thurman Feb 21 '21 at 17:43
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    You can check in System Settings | About | Graphics. It will say "NVIDIA" if it is being used. Try switching to a different session (Wayland or Xorg) on the GDM login screen, and see if you still have this issue. Not sure if this is your issue, but it would be a quick easy test to eliminate one possibility. Also note, if you pick "Wayland", NVIDIA is not used, even if you have the proprietary drivers installed (per the comment on this question: https://askubuntu.com/questions/1303794/why-does-settings-about-say-mesa-intel-instead-of-nvidia-when-using-waylan). – Enterprise Feb 21 '21 at 20:39
  • @PJSingh thanks: "Graphics" says llvmpipe. I'll switch to a different session now and see whether that helps. – Marnanel Thurman Feb 22 '21 at 19:20

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The issue is resolved, but I'm not sure which of the suggestions above resolved it! I suspect aptitude had resolved broken package dependencies which hadn't shown up until I rebooted.

All happy now. Thank you, lovely people.

Marnanel Thurman
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