I tried with a new user and got the same result. Reverse Depends: Depends: libgl1-mesa-dri Depends: libxatracker2
Home of the bug! They were both completely outdated. After the update I could safely remove the old llvm library, and now qtcreator works. Thx 2 u both, and sorry for bothering you on this channel (should have used a forum instead.) Martin P.S. However, dpkg shouldn't have installed qtcreator in the first place, with that outdated lib still in place. So, maybe there's some little thing to do for the package maintainers after all.
