I'm running MATE 18.04.4 and have this problem.
The fix above needs to be tweaked slightly for my system and I just wanted to
note how. Basically, the tmp file names can vary between Ubuntu flavors and to
get the right one you need to consult your /var/log/syslog file. Here's a
snippet from mine.
-------
Mar 24 12:55:01 HOST kernel: [168408.433315] audit: type=1400
audit(1585068901.826:56): apparmor="DENIED" operation="open"
profile="/usr/bin/evince-thumbnailer"
name="/tmp/.mate_desktop_thumbnail.8S5NH0" pid=18303 comm="evince-thumbnai"
requested_mask="wc" denied_mask="wc" fsuid=1000 ouid=1000
------
The 'name=' entry tells me I need to add the following line to my
/etc/apparmor.d/local/usr.bin.evince
file
owner /tmp/{,.}mate_desktop_thumbnail.* w,
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https://bugs.launchpad.net/bugs/1798091
Title:
thumbnailer cannot create tempfiles (with apparmor denials)
Status in evince package in Ubuntu:
Fix Released
Status in evince source package in Cosmic:
Fix Released
Status in evince source package in Disco:
Fix Released
Status in evince package in Debian:
Fix Released
Bug description:
* Impact
Nautilus fails to generate previews for pdf files
* Test case
Download/copy a pdf, open the directory in nautilus, a preview image
should be displayed
* Regression potential
Check that there are no other apparmor denials and the thumbnailer
works
-------------
While trying to create thumbnails in a directory from within nautilus,
I got:
[781429.784125] audit: type=1400 audit(1539694722.247:989): apparmor="DENIED"
operation="mknod" profile="/usr/bin/evince-thumbnailer"
name="/tmp/gnome-desktop-thumbnailer.png" pid=30937 comm="evince-thumbnai"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
[781429.940592] audit: type=1400 audit(1539694722.403:990): apparmor="DENIED"
operation="mknod" profile="/usr/bin/evince-thumbnailer"
name="/tmp/gnome-desktop-thumbnailer.png" pid=30941 comm="evince-thumbnai"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
[781430.314591] audit: type=1400 audit(1539694722.779:991): apparmor="DENIED"
operation="mknod" profile="/usr/bin/evince-thumbnailer"
name="/tmp/gnome-desktop-thumbnailer.png" pid=30945 comm="evince-thumbnai"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
[781431.283522] audit: type=1400 audit(1539694723.747:992): apparmor="DENIED"
operation="mknod" profile="/usr/bin/evince-thumbnailer"
name="/tmp/gnome-desktop-thumbnailer.png" pid=30949 comm="evince-thumbnai"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
[781431.518566] audit: type=1400 audit(1539694723.983:993): apparmor="DENIED"
operation="mknod" profile="/usr/bin/evince-thumbnailer"
name="/tmp/gnome-desktop-thumbnailer.png" pid=30953 comm="evince-thumbnai"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: evince 3.30.1-1
ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7
Uname: Linux 4.18.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 16 14:59:00 2018
InstallationDate: Installed on 2014-06-19 (1580 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: evince
UpgradeStatus: Upgraded to cosmic on 2018-10-07 (9 days ago)
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