you have installed apparmor, is the apparmor profile for Thunderbird also active?Please have a look at /usr/share/doc/thunderbird/README.apparmor
None of these instructions does help clearing that Problem.
you have installed apparmor, is the apparmor profile for Thunderbird also active?Please have a look at /usr/share/doc/thunderbird/README.apparmor
None of these instructions does help clearing that Problem.