okular does not print and no preview

[udippel]

Okular doesn't show any preview and doesn't print.
20_04 daily updated.
(Deleted all my printers and re-setup thrice, before I noticed the missing preview.)

Setup printer afresh, and $lpr -P foo file.pdf prints fabulously.

Okay, Preview brings up a red box on top briefly, followed by a brief 'welcome' and then it is just a single small empty page (original had 4 pages).

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: okular 4:19.12.3-2ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.11
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Wed Nov 11 12:36:49 2020
InstallationDate: Installed on 2019-03-14 (607 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: okular
UpgradeStatus: Upgraded to focal on 2020-09-29 (42 days ago)

[Matthias Fenner (inf0rmix)]

disabling appamor does the trick - so it seems to be a bug in the specific appamor confinement.

any advice how to rebuild it (I only have selinux skills :D )

[Matthias Fenner (inf0rmix)]

Adding

"# version 1

abi <kernel>,

include <local/VARIABLES>
@{SFX}=pdf PDF

profile okular /usr/bin/okular
{
include <local/ONLYLOCAL>
include <local/ISAKDE>
# include <local/USECUPS>

owner /home/*/.local/share/okular/** rw,
owner /home/*/.local/share/okular/bookmarks* l -> /home/*/.local/share/okular/#[0-9]*,

@{MYDATADIRS}/**.@{SFX} rw,
}
"

to /etc/apparmor.d/usr.bin.okular

and restarting appamor fixed the problem - i now can print using okular with activated appamor