With CB remote support's help I have CB v1.8.1 and my other apps (FreeCAD, etc.) working on my system--However I find i cannot allow any Linux Update Manager updates to be loaded or I'm back to FreeCAD and the PulseAudio Equalizer not launching, complaining about Qt version conflicts. Had to restore via Timeshift to get back to where it all works, and disable auto-updates to prevent further screw-ups.
I.e. I am not yet a "CB v1.8.1 happy-camper"--and still think QT's version management is a "fuster cluck"