I'm not sure where to start; Why doesn't apt update work or why can't I do-release-upgrade?
This is what I see when I ssh in:
Welcome to Ubuntu 19.04 (GNU/Linux 5.0.0-38-generic x86_64)
The repositories for older releases that are not supported (like 11.04, 11.10 and 13.04) get moved to an archive server. There are repositories available at http://old-releases.ubuntu.com.
sudo sed -i -re 's/([a-z...