Comment 4 for bug 1982791

I think do-release-upgrade should produce a more helpful error message than the following:

bdmurray@clean-impish-amd64:~$ do-release-upgrade
Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife

Please install all available updates for your release before upgrading.

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do-release-upgrade knows that the system's release is end of life and could update the sources.list file so that all updates can be installed.