Basics 4
- Check how much disk the systemd journal uses and shrink it
Check how much disk the journal uses, delete old files with vacuum, pin a size limit with a drop-in file, and find the units that fill the journal.
Ubuntu 24.04 · systemd 255 · settings per freedesktop.org journald.conf(5) and journalctl(1) - Find why a systemd service is failed
Read the Active and status lines of systemctl status, check the log from just before the failure, and fix 203/EXEC and "start request repeated too quickly".
Ubuntu 24.04 · systemd 255 (reproduced with transient units) - Fix "Could not calculate the upgrade" on Ubuntu 24.04 to 26.04
Diagnose "Could not calculate the upgrade" when moving from Ubuntu 24.04 to 26.04, then clear held packages, broken dependencies and conflicting PPAs.
Ubuntu 24.04 → 26.04 · Ubuntu docs and Launchpad reports, 2026-10 - Write a logrotate config and test it before using it
Write a logrotate config for an app log, preview it with -d, force a run with -f and a state file, and check the result. Covers copytruncate versus postrotate.
logrotate 3.21.0 · Ubuntu 24.04 · systemd 255