No, I have never tried Qt6. I don't know that everything supports that yet (such as craft, KStars, build scripts, etc).

The error you got looks a lot like a bug in INDI. Just to see if this helps, you could try this in Terminal:

cd ~/AstroRoot/craft-root/ ; source ~/AstroRoot/craft-root/craft/craftenv.sh;
craft -vi indiserver

See if it is successful. You could also specify which version like this:

craft -vi --target stable indiserver
craft -vi --target master indiserver

Maybe one of them has a bug or maybe some issue with it on your machine. This can probably be fixed.

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