The Supervisor needs access to the systemd journal for logging features
such as the
/host/logs API. These features don’t work if the journal
is not accessible.
systemd-journal-gatewayd service needs to be running on the host
and exposed to supervisor via unix socket.
If using Home Assistant OS, update to version 7 or later.
If using Home Assistant Supervised, run the following on the host:
sudo apt install systemd-journal-remote -y
and then reboot your system
If after upgrading you are still facing this error, reinstall
systemd-journal-remote with the following command
sudo apt-get install --reinstall systemd-journal-remote
and reboot your system
If you still see this issue then run the supervised installer on the host as the supervisor service may need an update as well.