Comment 16 for bug 1858412

xenial:

ubuntu@lp1858412-x:~$ dpkg -l systemd|grep systemd
ii systemd 229-4ubuntu21.27 amd64 system and service manager
ubuntu@lp1858412-x:~$ du -sh /var/log/journal/remote
65M /var/log/journal/remote
ubuntu@lp1858412-x:~$ sudo journalctl -D /var/log/journal/remote --vacuum-size=10M
ubuntu@lp1858412-x:~$ du -sh /var/log/journal/remote
65M /var/log/journal/remote

ubuntu@lp1858412-x:~$ dpkg -l systemd|grep systemd
ii systemd 229-4ubuntu21.28 amd64 system and service manager
ubuntu@lp1858412-x:~$ du -sh /var/log/journal/remote
65M /var/log/journal/remote
ubuntu@lp1858412-x:~$ sudo journalctl -D /var/log/journal/remote --vacuum-size=10M
Deleted archived journal /var/log/journal/remote/system@2cd50be57af347e1a473974288f23b15-0000000000000001-0005a4fe64b79740.journal (8.0M).
Deleted archived journal /var/log/journal/remote/system@2cd50be57af347e1a473974288f23b15-000000000000047d-0005a4fe7e0e6b7b.journal (8.0M).
Vacuuming done, freed 16.0M of archived journals on disk.
ubuntu@lp1858412-x:~$ du -sh /var/log/journal/remote
49M /var/log/journal/remote