Webmin 2.021 released

[Ilia]

Maybe even backwards compatible all the way to 6.07

If you have Virtualmin 6 repos it should work, unless @Joe haven’t push latest Webmin to those older repos, for some reason? If the repos you’re talking about prior Virtualmin 6, it’s expected no to work:

Old (pre-Virtualmin 6) repositories deprecated

Howdy all, After the latest round of updates in the old (pre-Virtualmin 6) apt and yum repositories, those repositories have reached End of Life. There will be no more updates to any unversioned Virtualmin repository (the repositories in /vm/6 and /vm/7 will continue to be maintained, and will be until Virtualmin 8 is released, when the /vm/6 repository will reach EOL). This means you’ll need to update your very old systems to use one of the newer repositories. It also means any very old insta…

You can always upgrade local repos to the newest ones:
https://www.virtualmin.com/documentation/repositories/