[okular] [Bug 456430] New: Add PDF digital signatures

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=456430

            Bug ID: 456430
           Summary: Add PDF digital signatures
           Product: okular
           Version: 20.12.3
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: owaschuwa at gmail.com
  Target Milestone: ---

SUMMARY
***
I am attempting to add PDF digital signatures by following
https://rajeeshknambiar.wordpress.com/2022/06/27/digitally-signing-pdf-documents-in-linux-with-hardware-token-okular/ 
The digital signatures option is not available in PDF Backend Configuration,
only "Enhance thin lines".
I have removed Okular using apt and reinstalled to Version 20.12.3 using snap.
I have also installed Poppler 21.09 by following
https://askubuntu.com/questions/1240998/how-to-install-poppler-0-73-on-ubuntu-20-04-any-change-since-18-04
***


STEPS TO REPRODUCE
1. Install Okular 20.12.3 using 'sudo snap install okular'
2. Open Okular > Settings > Configure Backends
3. Select PDF Backend Configuration

OBSERVED RESULT
Only "Enhance thin lines" option is available.

EXPECTED RESULT
"Certificate database" option should also be showing, as in p. 35 of
https://docs.kde.org/stable5/en/okular/okular/okular.pdf

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux (x86_64) release 5.13.0-52-generic
KDE Plasma Version: 5.18.8
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

ADDITIONAL INFORMATION
I'm fairly new to Linux so I'm sure I've made a mistake somewhere! Any help is
greatly appreciated, thanks.

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