For me, the fix in comment #2 worked only after I restarted apparmor:
sudo /etc/init.d/apparmor restart
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Permission error saving a file
Status in evince package in Ubuntu:
On Ubuntu 15.10, using evince 3.16.1-0ubuntu1, I fill out a PDF form.
When I save the form, I get the message "Error renaming temporary
file: Permission denied", and the file is not saved. I don't have
permissions trouble in any other apps.
The problem happens only when I'm using a filesystem that I mount in
/mnt, and not for example in my home directory or in /tmp. Although I
launch evince from the terminal, there are no unusual error messages
printed there. However, journalctl shows a string of error messages
(see attached log).
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