Hello @Lud97x and @Stefan_Lasiewski
We had the plans to have foreman-maintain to support the Ubuntu, however due to other priorities of foreman-maintain itself we dont have anything yet on Ubuntu platform.
Now I have started the work to have foreman-maintain supported for upstream scenarios. In this case we have most of the things ready but there are differences which we are adding now. So the short term plan now is, we come up with full upstream support including upgrades,backups, system checks etc for CentOS/RHEL as the team is accustom to this platform and then start the work for Ubuntu/Debian. If you wish to contribute then request you to contact me or @kgaikwad.
Thank You !