@Christina - I suggest filing a new bug with more specifics. That said,
I suspect you have a .dpkg-dist file in /etc/apparmor.d or
/etc/apparmor.d/abstractions that has changes that need to be merged
into your evince profile.

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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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