The Qt4 is missed in 20.04 LTS, not the Qt5. All other seems to be true.
Anyway HPLIP developers should fix all issues running it on 20.04 LTS. I see many negative reports about running HPLIP on 20.04 LTS. Check https://askubuntu.com/search?tab=newest&q=hplip%2020.04 .
The Qt4 is missed in 20.04 LTS, not the Qt5.
All other seems to be true.
Anyway HPLIP developers should fix all issues running it on 20.04 LTS. I see many negative reports about running HPLIP on 20.04 LTS. Check https:/ /askubuntu. com/search? tab=newest& q=hplip% 2020.04 .