Evince cannot be launched as root

[actionmystique]

Hello,
On ubuntu 13.10, if I run evince with "gksu evince", I get the following error messages:

** (evince:5860): WARNING **: Could not open X display
No protocol specified
Cannot parse arguments: Cannot open display:

Any suggestion?

[bapoumba]

http://ubuntuforums.org/showthread.php?t=1651832
May be there ?

[actionmystique]

Thanks for the link.
One user suggested the following trick in the thread:
sudo ln -s /etc/apparmor.d/usr.bin.evince /etc/apparmor.d/disable
sudo /etc/init.d/apparmor restart

I don't understand why a symbolic link would solve this case, but it works.

[actionmystique]

A side effect is that the "save current settings as default" does not work anymore, as far as the previously loaded page is concerned.
I cannot find the config file for evince.
Do you know how to solve this?

[mc4man]

I don't understand why a symbolic link would solve this case, but it works.
It 'works' because that link disables apparmor protection of evince from actions/permissions it's not intended for or shouldn't need to work