How to Limit Journals Size

Check journal size

sudo journalctl --disk-usage

Shrink journal size

sudo journalctl --vacuum-size=500M

Reduce archived files and leave last 2

sudo journalctl --vacuum-files=2

Verify journal - if there are any corruptions

sudo journalctl --verify

On Ubuntu you can permanently limit here

sudo nano /etc/systemd/journald.conf

SystemMaxUse=3G
SystemKeepFree=600M

sudo service systemd-journald restart