sudo apt update
to update/refresh your package lists.Unfortunately i have no idea how to remove.It looks like several repositories you’ve added to apt are incorrect, or invalid.
Some of them do not appear to have any builds available for your version of Ubuntu, the trisquel one seems to be pointing to an invalid ip, or perhaps the server is down, idk!
The opensuse one seems to be missing a public key.
I’d recommend removing those repositories.
Suse is a red-hat .rpm based distro, not a Debian .deb based distro. Adding that one seems a bit daft. I don’t imagine it would work at all with apt.
So remove all of those repositories that aren’t working, then runsudo apt update
to update/refresh your package lists.
I don’t think it’s completely trashed. The sources.list for apt just needs to be updated to remove all of the non working repositories. Then it should be ok.Yeah, you've pretty much trashed that install. Restore from backups or install anew.
If you restore from backups, only remove the offending PPAs. If you install anew, don't add PPAs until you are comfortable with the concept and know how to remove them.
"software-properties-common" is a handy GUI way to manage that stuff.
The sources.list for apt just needs to be updated to remove all of the non working repositories. Then it should be ok.
Suse is a red-hat .rpm based distro, not a Debian .deb based distro. Adding that one seems a bit daft. I don’t imagine it would work at all with apt.