After a while we have installed Linux Mint 19 and the newer version of KStars/Ekos.
All seems to work fine (and much more confidently that two years ago when our first try!) but there's an issue with our QHY6 guiding camera.
Ekos detects the ccd and we can guide well with Ekos or PHD2. The problem manifests when aborting guiding or image sequence without finalize it. Then, QHY6 hangs and then dissapears, it seems not detected by S.O. At first we thought it could be an issue caused by using a usb wire too large so we changed wire but an 1.8 m. USB 2.0 type B to a A and an extension amplified cable. The issue remains, to see again QHY6 we must close pc, wait a few seconds (30" aprox) to wipe out any electrical current and then, restart it. When starting KStars again, voilà, here it is QHY6.
We'll be very grateful if any of you can bring to us some clues...
Thanks in advance!!!