It's pretty simple, my internet works perfectly, I can use the software manager. But I can't refresh the list of updates on Update Manager, and can't update anything on my Linux Mint. Some time ago, I tried connecting my computer to my laptop (with no success) so I think I may have changed something and now I can't connect to repositories.
I tried lots of stuff already that I found browsing through forums but nothing worked so far, I'm kind of noob so it's hard for me to adapt solutions to my own computer.
Changing mirrors doesn't help at all and this is the error I'm getting:
Could not refresh the list of updates
Failed to fetch http://archive.removed/ubuntu/dists/ ... /InRelease 403 Forbidden IP,
The repository 'http://archive.removed/ubuntu xenial-removed InRelease' is not signed.