enter image description hereHello, I seem to be having trouble with opening Software Center, when I click on it nothing happens, I'm new to elementary OS and Linux. I think I did something wrong when I tried to update a repository.

I get a lot of "404 Not Found" when I run "sudo apt-get update && sudo apt-get upgrade", it ends with "E: Some index files failed to download. They have been ignored, or old ones used instead."

closed as off-topic by Hasan, lemonslice, Jeroen, Lewis Goddard Apr 18 at 14:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "The Question is about a release or feature that has been significantly updated, to the point at which upgrading fixes the issue or answers the question." – Hasan, lemonslice, Jeroen, Lewis Goddard
If this question can be reworded to fit the rules in the help center, please edit the question.