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I am using Ubuntu 20.04. Yesterday while looking for a package, I found that Evolution was due for an update. Since I never use it, I thought I would uninstall it. Being I was not aware that gnome is now being used as Ubuntu default desktop, I uninstalled other things I thought were associated with that as well.

Now I am getting this message from HPLIP.

No system tray detected on this system. Unable to start, exiting.

There were several programs that had icons on the system tray that are no longer there that I would like to have back.

Additionally, the side dock where favorites are kept no longer autohides and pops out when I run my mouse up against the left edge of my display. I now have to go click on the "Activities" link at the top left corner of the display. I have gone into settings numerous times and set the dock to autohide and every time I go back the setting has been disabled again. I presume this is because the feature is no longer installed.

Does anyone know exactly what package I may have uninstalled that I need for these two issues?

I did re-install a few gnome packages which fixed some things, but not these two.

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    Have you looked through your apt logs? There is a history of what you did. You should be fine just to reinstall what you removed.
    – Nmath
    Jul 2, 2020 at 17:48

1 Answer 1

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You can get the necessary packages installed once again by reinstalling the Ubuntu desktop system. To do that, open a Terminal window and run the following command

sudo apt install --reinstall ubuntu-desktop

Then reboot your system.

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    It is usually something simple, isn't it? That command is what I needed and sure enough, it resolve my issue. Thank you very much. I have been using Linux since 1999, but since Ubuntu cam out and made Linux easy for users, I reverted back to being a user. I am by no means an expert. Everything is back to normal. Jul 2, 2020 at 22:53

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