sudo apt install localepurge # remove unnecessary language package
sudo journalctl --disk-usage # check the log size first
sudo journalctl --vacuum-time=2d # remove logs older than 2 days
sudo journalctl --vacuum-size 10M # remove archived log files larger than 10M
nano /etc/systemd/journald.conf
SystemMaxUse=5M #设置最大为5M
systemctl restart systemd-journald