Thank you for using Ubuntu and taking the time to report a bug. Can you attach your /var/log/kern.log right after you try to open a PDF? It is possible that the new apparmor profile is causing you trouble.
Thank you for using Ubuntu and taking the time to report a bug. Can you attach your /var/log/kern.log right after you try to open a PDF? It is possible that the new apparmor profile is causing you trouble.