I recently upgraded my system to Kubuntu 21.04. Unfortunately, the kstars-bleeding packages are missing now in Muon Package Manager (and in apt as well) and there are no packages at ppa.launchpad.net/mutlaqja/ppa/ubuntu/po...n/k/kstars-bleeding/ for 21.04. Of course, I could use one of the available packages but would rather wait for a fix.
I think I read someplace that the Kstars team is only (mostly) supporting the LTS (Long Term Support) versions of Ubuntu, which would be 20.04 LTS, you may have a longer wait for the newer but less supported versions.
Well, I upgraded from 20.10 (non LTS) to 21.04. On 20.10 there is kstars-bleeding available. On the other hand, all the INDI packages are available for 21.04. So, building kstars-bleeding for 21.04 would be much appreciated.