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In 21.04, the UI should be displayed like this (image from wikipedia):

Ubuntu 21.04 with Gnome desktop

But, it displays like this in my computer:

Ubuntu 21.04 with Unity desktop

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?

Lorenz Keel
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7stage
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  • What is wrong with the UI and who said wiki is correct? – David Sep 02 '21 at 14:18
  • 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
  • I don't see the problem, please update your question and explain. – Soren A Sep 02 '21 at 14:30
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    The 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
  • Does this answer your question? [How to install unity desktop over gnome?](https://askubuntu.com/questions/493763/how-to-install-unity-desktop-over-gnome) – N0rbert Sep 02 '21 at 20:20

1 Answers1

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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
  • 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
  • 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