Problem: Debian server and Ubuntu desktop show notification that systemd-journald has crashed. After execute command
systemctl status systemd-journald from the terminal, the output show message
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable. in service.
Resolution: Remove Crash Dump
Crash directory holds system crash dumps. As of the date of this release of the standard, system crash dumps were not supported under Linux but may be supported by other systems which may comply with the FHS. Debian has extended the standard for user space crashes as well via corekeeper to stores normal coredumps in subfolders of /var/crash. Removing contents of /var/crash can make the System program problem detected popups disappear on Ubuntu.
Step 1: Remove all the files in /var/crash folder or using command:
sudo rm /var/crash/*.*
Step 2: Reboot the system.
Ubuntu Forums: Crash notification on every reboot – systemd-journald
Debian Package: corekeeper (1.6 and others)