Due to too old version… anon-meta-packages whonix-workstation-packages-recommended-gui should no longer Depends: on Debian -- Details of package onionshare in buster?
In other words: No longer install OnionShare by default inside Whonix?
(Until Whonix gets rebased to Debian bullseye (Whonix 16) and OnionShare 2.3.1 arrived in Debian bullseye.)
Documentation currently still mentions v1.3.2:
Figure: First Start of OnionShare v1.3.2 GUI
In v1.3.2 you can check
Remove onionshare non-flatpak instructions?