Better work-around is, as metioned by Philip Langdale, editing the file
/etc/apparmor.d/usr.bin.evince
like this (insert the nameservice-line):
/usr/bin/evince-thumbnailer {
#include <abstractions/evince>
#include <abstractions/nameservice>
:
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https://bugs.launchpad.net/bugs/778638
Title:
evince-thunbnailer gets permission denied from apparmor (and hangs the
system for long periods of time)
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