I just wanted to add that I had this issue for a while too on Ubuntu
20.04.1 LTS. None of the above solutions worked for me but what did work
was installing and using gnupg2.

Then edit /etc/apparmor.d/usr.lib.libreoffice.program.soffice.bin to use
gpg2 instead of gpg. So I edit the line /usr/bin/gpg rm to /usr/bin/gpg2
like below:


  # there is abstractions/gnupg but that's just for gpg1...
  profile gpg {
    #include <abstractions/base>

   /usr/bin/gpgconf rm,
   /usr/bin/gpg2 rm,
   /usr/bin/gpgsm rm,

    owner @{HOME}/.gnupg/* r,
    owner @{HOME}/.gnupg/random_seed rk, 
  }

  # probably should become a subprofile like gpg above, but then it doesn't
  # work either as it tries to access stuff only allowed above...


I hope this works for others too! My key generation took a while but it worked.

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

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

Status in libreoffice package in Ubuntu:
  Confirmed
Status in libreoffice source package in Focal:
  Confirmed

Bug description:
  LibreOffice should be able to digitally sign a document with a GPG
  private key in the GPG key chain. However, the key is not listed in
  the list of certificates shown following the menu File - Digital
  Signatures - Digital Signatures... - Sign Document..., after, e.g.,
  creating and saving a document on LibreOffice Writer.

  This seems to be because apparmor doesn't allow LibreOffice to
  communicate with GPG agent. /var/log/syslog shows lines like:

  Jul  1 15:15:14 misoan kernel: [20238.265212] audit: type=1400
  audit(1593652514.311:333): apparmor="DENIED" operation="connect"
  profile="libreoffice-soffice//gpg" name="/run/user/1001/gnupg/S.gpg-
  agent" pid=23725 comm="gpg" requested_mask="wr" denied_mask="wr"
  fsuid=1001 ouid=1001

  Locally, I could make LibreOffice show the GPG private key with the
  following change against
  /etc/apparmor.d/usr.lib.libreoffice.program.soffice.bin

  --- apparmor.d.20200702/usr.lib.libreoffice.program.soffice.bin       
2019-10-03 10:31:21.000000000 -1000
  +++ apparmor.d/usr.lib.libreoffice.program.soffice.bin        2020-07-02 
08:59:44.516754728 -1000
  @@ -223,6 +223,7 @@
   
       owner @{HOME}/.gnupg/* r,
       owner @{HOME}/.gnupg/random_seed rk,
  +    owner /{,var/}run/user/*/** rw,
     }
   
     # probably should become a subprofile like gpg above, but then it doesn't

  Tested with the following packages on Xfce4
  $ lsb_release -rd
  Description:  Ubuntu 20.04 LTS
  Release:      20.04
  $ apt-cache policy libreoffice-common | grep Installed
    Installed: 1:6.4.3-0ubuntu0.20.04.1
  $ apt-cache policy gpg gpg-agent | grep -B1 Installed
  gpg:
    Installed: 2.2.19-3ubuntu2
  --
  gpg-agent:
    Installed: 2.2.19-3ubuntu2
  $ apt-cache policy apparmor | grep Installed
    Installed: 2.13.3-7ubuntu5.1

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