Hey Jamie, sorry but it seems that issue didn't get fixed, see bug
#1799688
The denied error states
name="/tmp/gnome-desktop-thumbnailer.png"
or your rule is
"owner /tmp/{,.}gnome_desktop_thumbnail.* w,"
there is at least a mismatch _ vs - in the filename
but also "thumnail.*" seems to not work, if I replace ".*" by "er.png"
(e.g the exact filename) then nautilus starts showing the pdf previews
(I tested by copying a pdf as a new bug.pdf name)
** Changed in: evince (Ubuntu)
Status: Fix Released => Confirmed
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https://bugs.launchpad.net/bugs/1798091
Title:
thumbnailer cannot create tempfiles (with apparmor denials)
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