What do I need to do here

I have had some problems with some user breaking into my Ubuntu system through ssh. I wonder if someone would take a look at my etc/ssh files on my system and look at them and tell me if this has happened again. Also, I see this information in my log files that is below. Do I need to change my computer disk name to comply with what this log is trying to get at. Or am I misunderstanding it?

Thanks for any help.
Also, if I could contribute to the project in any way, let me know. I am not much on programming but could probably help with writing or a similar task.
B. Perry

ar 14 14:54:46 Five-live-observers sendmail[5477]: My unqualified host name (Five-live-observers) unknown; sleeping for retry
Mar 14 14:55:47 Five-live-observers sendmail[5477]: unable to qualify my own domain name (Five-live-observers) -- using short name
Mar 14 14:55:47 Five-live-observers sendmail[5477]: alias database /etc/mail/aliases rebuilt by root
Mar 14 14:55:47 Five-live-observers sendmail[5477]: /etc/mail/aliases: 4 aliases, longest 10 bytes, 66 bytes total
Mar 14 14:55:47 Five-live-observers sm-mta[5538]: My unqualified host name (Five-live-observers) unknown; sleeping for retry
Mar 14 14:55:49 Five-live-observers sm-msp-queue[5543]: My unqualified host name (Five-live-observers) unknown; sleeping for retry
Mar 14 14:56:47 Five-live-observers sm-mta[5538]: unable to qualify my own domain name (Five-live-observers) -- using short name
Mar 14 14:56:48 Five-live-observers sm-mta[5562]: starting daemon (8.14.4): SMTP+queueing@00:10:00
Mar 14 14:56:49 Five-live-observers sm-msp-queue[5543]: unable to qualify my own domain name (Five-live-observers) -- using short name
Mar 14 14:56:55 Five-live-observers dbus[1017]: [system] Activating service name='org.freedesktop.SystemToolsBackends.UsersConfig2' (using servicehelper)
Mar 14 14:56:55 Five-live-observers dbus[1017]: [system] Activating service name='org.freedesktop.SystemToolsBackends.GroupsConfig2' (using servicehelper)
Mar 14 14:56:55 Five-live-observers dbus[1017]: [system] Activating service name='org.freedesktop.SystemToolsBackends.SelfConfig2' (using servicehelper)
Mar 14 14:56:55 Five-live-observers dbus[1017]: [system] Successfully activated service 'org.freedesktop.SystemToolsBackends.GroupsConfig2'
Mar 14 14:56:55 Five-live-observers dbus[1017]: [system] Successfully activated service 'org.freedesktop.SystemToolsBackends.UsersConfig2'
Mar 14 14:56:55 Five-live-observers dbus[1017]: [system] Activated service 'org.freedesktop.SystemToolsBackends.SelfConfig2' failed: Launch helper exited with unknown return code 255
Mar 14 15:00:01 Five-live-observers CRON[5798]: (root) CMD ( test -x /usr/sbin/tigercron &)
Mar 14 15:00:01 Five-live-observers CRON[5799]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp)
Mar 14 15:00:02 Five-live-observers sm-msp-queue[5828]: My unqualified host name (Five-live-observers) unknown; sleeping for retry
Mar 14 15:00:32 Five-live-observers sudo: pam_ecryptfs: pam_sm_authenticate: /home/orwells-literature is already mounted
Mar 14 15:01:02 Five-live-observers sm-msp-queue[5828]: unable to qualify my own domain name (Five-live-observers) -- using short name
Mar 14 15:06:51 Five-live-observers dhclient: DHCPREQUEST of 192.168.10.101 on eth0 to 192.168.10.1 port 67
Mar 14 15:06:51 Five-live-observers dhclient: DHCPACK of 192.168.10.101 from 192.168.10.1
Mar 14 15:06:51 Five-live-observers dhclient: bound to 192.168.10.101 -- renewal in 3346 seconds.
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: (eth0): DHCPv4 state changed bound -> renew
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: address 192.168.10.101
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: prefix 24 (255.255.255.0)
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: gateway 192.168.10.1
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: hostname 'Comcast'
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: nameserver '192.168.10.1'
Mar 14 15:06:51 Five-live-observers NetworkManager[1098]: domain name 'hsd1.pa.comcast.net.'
Mar 14 15:06:51 Five-live-observers dbus[1017]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Mar 14 15:06:51 Five-live-observers dbus[1017]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'