In 21.04, the UI should be displayed like this (image from wikipedia):
But, it displays like this in my computer:
I upgraded 16.04 to 18.04, then 18.04 to 20.04, then 20.04 to 21.04. How can I fix this UI?
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What is wrong with the UI and who said wiki is correct? – David Sep 02 '21 at 14:18
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I’m confuzzled. Is the concern the lack of desktop icons? You may be able to have them enabled by toggling some of the display settings – matigo Sep 02 '21 at 14:26
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I don't see the problem, please update your question and explain. – Soren A Sep 02 '21 at 14:30
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1The problem is that you upgraded from 16.04 to 21.04 which is not a supported upgrade path. – pLumo Sep 02 '21 at 14:43
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Does this answer your question? How to install unity desktop over gnome? – N0rbert Sep 02 '21 at 20:20
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In 16.04, Unity was the default Desktop environment. As you used an unsupported upgrade path from 16.04 -> 21.04 it was not changed after your upgrade. So, you're still using unity-desktop as default.
Install ubuntu-desktop if not already installed and switch the Desktop Environment to Gnome before you login.
sudo apt install ubuntu-desktop
You probably also need to change your Display manager to gdm3 (Default in 16.04 was lightdm). Run sudo dpkg-reconfigure gdm3 and chose gdm3.
However... I guess, you will notice more issues related to using an unsupported upgrade path. If that is the case, you should consider a reinstall.
pLumo
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I upgraded it by 16.04 to 18.04 to 20.04 to 21.04. It took about 1 days! – 7stage Sep 02 '21 at 22:48
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There is no tested, supported upgrade path directly from 20.04 to 21.04. That suggests you used an unsupported method. In turn, that suggests you may have used unsupported methods for other steps of your upgrades. We don't know what you did wrong -- there are too many possible variables. I can tell you that test installs that I have properly release-upgraded from 16.04 to 18.04 correctly switched from Unity to Gnome. – user535733 Sep 03 '21 at 02:28
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No I mean I upgraded 16.04 to 18.04 then 18.04 to 20.04 then 20.04 to 21.04. But I accidently removed GNOME a while ago and I will install 16.04 and upgrade to 18.04 – 7stage Sep 03 '21 at 03:58