Output from journalctl
sudo journalctl |grep DENIED |less
May 22 10:28:20 localhost.localdomain kernel: audit: type=1400 audit(1495448900.687:3895): apparmor="DENIED" operation="open" profile="snap.blink.blink" name="/sys/class/gpio/export" pid=1852 comm="blink" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
May 22 10:28:20 localhost.localdomain audit[1852]: AVC apparmor="DENIED" operation="open" profile="snap.blink.blink" name="/sys/class/gpio/export" pid=1852 comm="blink" requested_mask="w" denied_mask="w" fsuid=0 ouid=0