When updating I get the error
W: The repository 'http://ppa.launchpad.net/mc3man/trusty-media/ubuntu xenial Release' does not have a Release file.
Here I find another statement on this error: How can I fix a 404 Error when using a PPA or updating my package lists?
But this recommends removing certain ppas and I'm not sure if I should do that since it might mean not getting the updates I need. Is this what I should do?
sudo do-releases-upgrade
to get an supported release of Ubuntu. help.ubuntu.com/community/EOLUpgrades Oh, it was an old PPA. I just had this problem myself, and it was solved by this trick. I came here first when I did a search. – Anders Jan 26 '18 at 4:58