Thank you, I will have a look.

In the meanwhile, gdb prints these last lines

org.kde.kstars.ekos.align: "Idle."
[Detaching after fork from child process 11826]
org.kde.kstars.ekos.align: "Detected Astrometry.net version 0.78"
org.kde.kstars.ekos: "CCD Simulator is online."

Thread 19 "kstars" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xa08390d0 (LWP 11822)]
0xb6fc41dc in strlen () from /usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so
(gdb) 

Maybe it is something specific of the RPI Pi4?

Read More...