This is very much a bug in nvidia-graphics-drivers-340. One can debate if software-properties should or shouldn't purge (though traditionally, the argument was that silent frontends shouldn't purge because the user hasn't explicitly asked for that), but if a removed package's unpurged conffiles cause the system to misbehave, that package needs to be rethought to avoid that situation.
** Package changed: nvidia-settings (Ubuntu) => nvidia-graphics- drivers-340 (Ubuntu) ** Changed in: nvidia-graphics-drivers-340 (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1761593 Title: Uninstall left nouveau blacklisted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340/+bug/1761593/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs