Вот высер последних строчек journalctl сразу после возникновения ошибки:
січ 14 20:30:01 linux-sipf.site kernel: type=1006 audit(1421260201.292:63): pid=10627 uid=0 old auid=4294967295 new auid=0 old ses=4294967295 new ses=
січ 14 20:30:01 linux-sipf.site systemd[10628]: pam_unix(systemd-user:session): session opened for user root by (uid=0)
січ 14 20:30:01 linux-sipf.site CRON[10627]: pam_unix(crond:session): session closed for user root
січ 14 20:30:01 linux-sipf.site systemd[10629]: pam_unix(systemd-user:session): session closed for user root
січ 14 20:30:12 linux-sipf.site ModemManager[2318]: <info> Modem /org/freedesktop/ModemManager1/Modem/1: signal quality updated (0)
січ 14 20:30:42 linux-sipf.site ModemManager[2318]: <info> Modem /org/freedesktop/ModemManager1/Modem/1: signal quality updated (0)
січ 14 20:31:12 linux-sipf.site ModemManager[2318]: <info> Modem /org/freedesktop/ModemManager1/Modem/1: signal quality updated (0)
lines 3301-3341/3341 (END)