From: jbicha@debian.org   
      
   On Sun, Feb 15, 2026 at 8:49 AM Jeremy Bícha  wrote:   
   > On Sun, Feb 15, 2026 at 12:43 AM Shawn K. Quinn    
   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   
      
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