Tried to install kstars off the PPA in 20.04 but error with:
The following packages have unmet dependencies:
kstars-bleeding : Depends: libwcs6 (>= 4.8.2) but it is not installable
It appears 20.04 has version libwcs7 installed but it wont work with this so maybe you need to update your builds for Focal.
May I ask why you are trying to install on UBUNTU 20.04? IMO unless you are a developer and know what you do, you may consider stick with the stable LTS versions like 18.04.
AFAIK 20.04 is an unsupported beta release at this time, and many things can be changed that may just give you incompatibility issues unless you know how to fix it.