On 2/15/2026 9:53 AM, Shawn K. Quinn wrote: > On 2/15/26 07:49, Jeremy Bícha 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. > > If it is a symptom of my unusual upgrade path, this is the first major > one. It's been long enough that I almost forgot that this started as an > Ubuntu install many years ago--long enough that any backups of the > original Ubuntu install I may have made are long gone so I can't go back > and check to see what was there. > > If that apparmor profile didn't come from the Ubuntu package, then I > don't see how that's a cause of this specific issue.
Where else could it have come from, if not from some old Ubuntu Thunderbird package? Perhaps it came from some Ubuntu Thunderbird package dating from before the time before Ubuntu started delivering Thunderbird in a snap package instead of a deb package. It is likely modern Debian would find syntax errors in such an apparmor profile originating on a very old Ubuntu installation. It is also likely, as Jeremy mentioned in an earlier message, that the Debian postinst script that was intended to disable the Thunderbird apparmor profile was never executed on your box or for some other reason the Thunderbird apparmor profile never was disabled, making your box, like mine, a non-default installation of Thunderbird on Debian. Cheers. > > On 2/15/26 08:24, Jeremy Bícha wrote:> 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. > > I am noting this advice. However, to be honest, this computer is > probably nearing end-of-life (it originally came with Windows 7, it's on > its second power supply, and that form factor power supply is becoming > increasingly rare, in addition to the usual obsolescence). I expect to > either retire it by the end of 2027 or install some other OS on it > before that date. >
