btw, Indi Web manager app can start the simulators without any issues.
However, recompiling from the github sources fixed the launch issues for me. I have a Celestron device connection issue now, which I haven't investigated.
120 MM Skywatcher Esprit on Celestron CGX, ZWO ASI 224MC guiding, Pegasus FocusCube v2+PPBA
Nikon Z7 8256 x 5504, 35.9 x 23.9mm 4.34 um. Triad Ultra Quad NB Filter
1) Odroid-N2 Ubuntu-mate 20.04.4 2) StellarMate RPI4 8G
The good, the bad, the ugly at sciencedowneast.no-ip.ca/zenphoto/