Correction. The light-theme was installed, so there is no problem with ubuntu-meta. (I got confused by the fact that there was no "light theme" in the appearance dialog).
Nevertheless, there is a problem with the upgrade. It should either not deinstall human-theme or automatically switch to one of the light themes for all users.
Correction. The light-theme was installed, so there is no problem with ubuntu-meta. (I got confused by the fact that there was no "light theme" in the appearance dialog).
Nevertheless, there is a problem with the upgrade. It should either not deinstall human-theme or automatically switch to one of the light themes for all users.