On Sun, Jul 14, 2019 at 07:12:59PM +0200, Sven Joachim wrote: > This can happen if you have assigned a negative Pin-Priority to > libfuse3-dev. According to apt_preferences(5), a Priority < 0 "prevents > the version from being installed", and apparently apt achieves this by > pretending that the package is not there at all.
Thanks for the hint; you called it exactly. I had this in my apt preferences: Package: * Pin: release a=testing Pin-Priority: 900 Package: * Pin: release o=Debian Pin-Priority: -10 ... and I'm currently still on Buster, having not moved on to Bullseye yet. - Ted