So I am hitting problem number 3 today.
I avoided the upgrade issue by simply not upgrading (after trying 3 times, I got tired or reflashing the SD card). I am waiting for a second GPS Dongle as the GPS problem might very well be a hardware issue.
Now, I finally launched my profile. I started with just the mount (NexStar to which a 6SE is attached): connection was successful, and it properly tracked the moon for 10 minutes. Then I added the ZWI driver for the ASI224 that I plugged instead of the eyepiece, and from that moment on, the NexStar stopped connecting. I restarted the RPi several times, restarted the controller, re-created the profile from scratch. The problem is always the same (see image). I am a bit at a loss.
I used NexStar before with 8SE and it was fine. the error day that there is no /dev/ttyUSB1, which means that the device got disconnected (maybe) or something else happened.
to debug this issue, please try the following:
1. After starting/restarting RPi and before executing KStars, type the following command "lsusb" and copy the results in a text file.
2. Start KSTARS using debug application, and make sure you debug all options.
3. When you start the profile, don't connect immediately (disable auto-connect from the profile), and before connecting, make sure that you debug in a file for all options under debug group.
4. Now it's time to run and try to emulate the problem again.
Thanks. I finally solved the problem. My 6SE had lost alignment, and apparently the connection cannot be established without completing the initial alignment first.