On Sun, Feb 15, 2026 at 8:49 AM Jeremy Bícha <[email protected]> wrote: > On Sun, Feb 15, 2026 at 12:43 AM Shawn K. Quinn <[email protected]> wrote: > > The only really unusual thing about it is that it began as an Ubuntu > > install and was cross-upgraded a couple of years ago. I doubt this is > > related to that based on the other messages I have since received on this > > bug, however. > > Actually, what you did is very unusual. Crossgrading from Ubuntu to > Debian is not supported. Ubuntu's thunderbird packaging was managed > completely separately from Debian's and I believe it didn't provide an > apparmor profile. Your situation may not have been handled by Debian's > postinst script.
Shawn, I recommend that you make time to do a clean Debian install. Most packages on your system are probably ok, but there may be a few like thunderbird where you accidentally have a non-default install which can lead to unexpected behavior. The problem is that it's not easily possible to tell which packages are in this unintended state. Backup your user config and data before doing a new install. Thank you, Jeremy Bícha
