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sudo apt-get update

gives me this error: 

Err:20 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu disco Release
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done                      
E: The repository 'http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu disco Release' does not have a Release file.

I don't know if this is related but sudo in general also gives me this error: 

   Traceback (most recent call last):
  File "/lib/security/howdy/compare.py", line 17, in <module>
    import cv2
ModuleNotFoundError: No module named 'cv2'
Unknown error: 1
Angela
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    You might want to try disabling that 3rd party PPA before running the upgrade. The actual upgrade command is do-release-upgrade, but then again, that command should disable all 3rd party PPAs before install. – Terrance Dec 11 '19 at 18:50
  • If my answer is helpful, please remember to accept it by clicking the checkmark and up-arrow icons just to the left of my answer. Thanks! – heynnema Dec 11 '19 at 22:28
  • status please... – heynnema Dec 14 '19 at 00:01

1 Answers1

1

http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu is a very old repo, and their last release was for bionic (not disco).

You can do no wrong by opening Software & Updates, and deleting that PPA.

heynnema
  • 70,711