I have an Ubuntu Server 16.04LTS and its rebooting every 5 minutes. I checkout some logs (syslog, kernel.log and the last reboot command) and there is nothing suspicious.
Anyone has any trick to discover this?
On server has installed a LAMP service, Dovecot and Postfix (mail server).
Logs of last reboot command:
reboot system boot 3.13.0-96-generi Mon Sep 26 11:27 - 11:31 (00:03)
reboot system boot 3.13.0-96-generi Mon Sep 26 11:22 - 11:31 (00:08)
reboot system boot 3.13.0-96-generi Mon Sep 26 11:17 - 11:31 (00:13)