/var/log/journal/ec21c666732bae56d044984babbf58d8/user-1000.journal code example
Example: ubuntu cleanup systemd journal
$ journalctl --vacuum-time=10d
...
Vacuuming done, freed 2.3G of archived journals on disk.
$ journalctl --vacuum-time=10d
...
Vacuuming done, freed 2.3G of archived journals on disk.