Comment 12 for bug 1959375

Hi Brian,
  I finally tested the new packages on Ubuntu Core 18 (with the bionic packages) and Ubuntu Core 20 (with the focal ones). I first tried to reproduce the issue in Ubuntu Desktop, by making /etc/groups and /etc/passwd read-only and indeed I couldn't add my user to a group, but unfortunately then I couldn't get the extrausers database setup correctly, so I gave up and just ran a quick smoke test to verify that the new binaries work as expected and instead focused on Ubuntu Core, that's where we initially had the issue.

The only problem is that I didn't test the entire deb packages, since the root FS in UC is read-only and not debian-based, but I just extrated the binaries from the passwd deb package and bind-mounted them over the original UC ones. Then I was able to add my user to a group, without needing to specify the --extrausers parameter.

I hope that this is good enough as a verification.