sshd|plinth|fail2ban services are unavailable.
https://freedombox/_cockpit/system/services at many processes:
sshd.service is masked.
Failed to restart fail2ban.service: Unit fail2ban.service is masked.
ournalctl -b 0 -u plinth have no data and
systemctl unmask|enable|start commands have no desired result
‘freedombox’ package can be removed during the upgrade process
apt install freedombox