Pretty simply I have impish and want to upgrade. I ran do-release-upgrade but it requires apt-get upgrade first which now fails due to the URLs being gone (Please install all available updates for your release before upgrading.):
Err:3 http://archive.ubuntu.com/ubuntu impish-updates/main amd64 ubuntu-advantage-tools amd64 27.9~21.10.1
404 Not Found [IP: 185.125.190.39 80]
Err:4 http://archive.ubuntu.com/ubuntu impish-updates/main amd64 ubuntu-release-upgrader-core all 1:21.10.10
404 Not Found [IP: 185.125.190.39 80]
Err:5 http://archive.ubuntu.com/ubuntu impish-updates/main amd64 python3-distupgrade all 1:21.10.10
404 Not Found [IP: 185.125.190.39 80]
So how do I update so I can upgrade? Thanks.