home-assistant.io/source/more-info/unsupported/systemd_journal.markdown

title	description
Systemd Journal	More information on why systemd journal marks the installation as unsupported.

The issue

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.

The solution

The 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.