Hi Guido, > The apparmor profile has denials. That means that it will prevent TB > from accessing files but not lock it. So what the above is not prove > that Apparmor is not at fault yet. You would have to disable the profile > using aa-disable and see if thunderbird starts then.
thanks to your suggestions I did try again with explicitely disabled apparmor profile for thunderbird and it worked! I did the following: $ sudo ln -s /etc/apparmor.d/usr.bin.thunderbird /etc/apparmor.d/disable/ $ sudo apparmor_parser -R /etc/apparmor.d/usr.bin.thunderbird (Checked with aa-status that the profile was no longer loaded) After that, both `thunderbird` and `/usr/lib/thunderbird/thunderbird` started (i.e. did not fail to connect to the X Server). Unfortunately, I have been unable to get any logs from apparmor. I get the following error message from `aa-audit` and `aa-complain`: $ sudo aa-complain thunderbird Setting /usr/bin/thunderbird to complain mode. ERROR: /etc/apparmor.d/usr.bin.thunderbird contains no profile I checked /var/log/kern.log, /var/log/apparmor/ and /var/log/messages for any relevant logs, but could not find any. How can I further debug this apparmor issue? Greetings Jack
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