On my computer (Ubuntu Mate 20.04) this problem also causes the Tool,
Options dialog to hang for around 1 minute while trying to connect to
the GPG agent. The /var/log/syslog file lists lots of apparmor DENIED
entries and the strace of the soffice program show lots of "gpg: can't
connect to the agent" errors for around one minute.

My solution was also to modify the
/etc/apparmor.d/usr.lib.libreoffice.program.soffice.bin file to add to
the gpg profile section (just like zunda user did):

    owner /{,var/}run/user/[0-9]*/gnupg/S.gpg-agent rw,
    owner @{HOME}/.gnupg/* rw,


(the second line seems not to be required to sign the document but is required 
to use the functions of the Certificate Manager, like adding new keys).

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https://bugs.launchpad.net/bugs/1886092

Title:
  libreoffice doesn't list gpg private key for a digital signature

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