Dear Maintainer,
Some complementary information about this bug.
Since some month opening attached file in thunderbird does not work anymore.
In the log when I try to open a pdf I have this message :
Jan 11 10:47:46 eiffel6 kernel: [40296.963168] audit: type=1400
audit(1515664066.510:296): apparmor="DENIED" operation="exec"
profile="thunderbird" name="/usr/bin/acroread" pid=12815
comm="thunderbird" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
After I do
aa-disable /etc/apparmor.d/usr.bin.thunderbird
acroread is launched correctly.
I observe this problem on a laptop running debian testing up to date.
With my best regards
--
Francois Mescam