I upgraded from Ubuntu 18.04 LTS to 20.04 yesterday, The update ran successfully and rebooted the system. As soon as I logged in to the desktop, I clicked on the applications menu and there were no icons. I tried searching for existing installed software but it kept showing me "Searching . . . ". I went to the frequents tab and the menu crashed and some notification about an internal error has been detected was shown.

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    How did you do the upgrade? Officially, users are not currently notified yet through the Software Updater about the possibility to upgrade. – vanadium Apr 25 at 11:16

I had the same problem. To fix it, type:

sudo apt install --reinstall gnome-control-center

If you have trouble logging in after reboot, do:

  1. ctrl + alt + f2
  2. Login in
  3. sudo apt update
  4. sudo apt upgrade
  5. sudo reboot

Good luck.

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    Worked perfectly, didn't have any login trouble as ubuntu -- right after reinstallation -- notified me about an important system upgrade and i ran and installed all the updates. – Sanxchep Sharma May 5 at 5:08

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