From: jbicha@debian.org   
      
   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.   
      
   Thank you,   
   Jeremy Bícha   
      
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