For me :
My system is getting restarted again and again.
When i did create log file for the reason for restarting system.
then i have got this below logs:




Aug  5 16:42:58 lsadmin23 systemd[1]: Starting Hostname Service...
Aug  5 16:42:58 lsadmin23 dbus[2605]: [system] Successfully activated service 'org.freedesktop.hostname1'
Aug  5 16:42:58 lsadmin23 systemd[1]: Started Hostname Service.
Aug  5 16:44:22 lsadmin23 lsass: [LwKrb5GetTgtImpl /builder/src-buildserver/Platform-8.3/src/linux/lwadvapi/threaded/krbtgt.c:276] KRB5 Error code: -1765328360 (Message: Preauthentication failed)
Aug  5 16:44:22 lsadmin23 lsass: [lsass] Failed to authenticate user (name = 'pramod.d') -> error = 40022, symbol = LW_ERROR_PASSWORD_MISMATCH, client pid = 5585
Aug  5 16:45:49 lsadmin23 acvpnagent[3514]: Function: CreateThreatReportDirChangeEvent File: ../../vpn/PhoneHome/PhoneHomeAgent.cpp Line: 740 Failed to get threat directory information from settings
Aug  5 16:45:49 lsadmin23 acvpnagent[3514]: Function: OnTimerExpired File: ../../vpn/PhoneHome/PhoneHomeAgent.cpp Line: 1092 Failed to create threat report dir change event
Aug  5 16:47:53 lsadmin23 systemd[1]: Started CUPS Scheduler.
Aug  5 16:49:26 lsadmin23 lsass: [LwKrb5GetTgtImpl /builder/src-buildserver/Platform-8.3/src/linux/lwadvapi/threaded/krbtgt.c:276] KRB5 Error code: -1765328360 (Message: Preauthentication failed)
Aug  5 16:49:26 lsadmin23 lsass: [lsass] Failed to authenticate user (name = 'pramod.d') -> error = 40022, symbol = LW_ERROR_PASSWORD_MISMATCH, client pid = 5770
Aug  5 16:50:13 lsadmin23 systemd[1]: Starting Cleanup of Temporary Directories...
Aug  5 16:50:13 lsadmin23 systemd-tmpfiles[5809]: [/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
Aug  5 16:50:13 lsadmin23 systemd[1]: Started Cleanup of Temporary Directories.
Aug  5 17:00:53 lsadmin23 systemd[1]: Started CUPS Scheduler.
Aug  5 17:09:01 lsadmin23 CRON[6269]: (root) CMD (  [ -x /usr/lib/php/sessionclean ] && /usr/lib/php/sessionclean)
Aug  5 17:13:54 lsadmin23 systemd[1]: Started CUPS Scheduler.
Aug  5 17:17:01 lsadmin23 CRON[6568]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Aug  5 17:19:11 lsadmin23 kernel: [ 2651.438323] perf interrupt took too long (2587 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
Aug  5 17:26:55 lsadmin23 systemd[1]: Started CUPS Scheduler.
Aug  5 17:27:13 lsadmin23 systemd[1]: Starting Automatically refresh installed snaps...
Aug  5 17:27:15 lsadmin23 /usr/lib/snapd/snapd[2726]: daemon.go:180: DEBUG: uid=0;@ GET /v2/find?q=&select=refresh 2.003151052s 200
Aug  5 17:27:15 lsadmin23 snap[6943]: All snaps up-to-date.
Aug  5 17:27:15 lsadmin23 systemd[1]: Started Automatically refresh installed snaps.
Aug  5 17:27:15 lsadmin23 systemd[1]: snapd.refresh.timer: Adding 2h 45min 52.637887s random time.
Aug  5 17:27:15 lsadmin23 systemd[1]: snapd.refresh.timer: Adding 2h 38min 5.394226s random time.
Aug  5 17:36:03 lsadmin23 org.gnome.evolution.dataserver.Sources5[3941]: ** (evolution-source-registry:4267): WARNING **: secret_service_search_sync: must specify at least one attribute to match
Aug  5 17:39:01 lsadmin23 CRON[7173]: (root) CMD (  [ -x /usr/lib/php/sessionclean ] && /usr/lib/php/sessionclean)
Aug  5 17:39:55 lsadmin23 systemd[1]: Started CUPS Scheduler.
Aug  5 17:52:56 lsadmin23 systemd[1]: Started CUPS Scheduler.
Aug  5 17:53:21 lsadmin23 gnome-session[4147]: ** (zeitgeist-datahub:4586): WARNING **: zeitgeist-datahub.vala:212: Error during inserting events: GDBus.Error:org.gnome.zeitgeist.EngineError.InvalidArgument: Incomplete event: interpretation, manifestation and actor are required






Please check it, and assist me with solution.
As i got fed up with system