升级14.10后，启动出了点小问题，求助!

以下是 dmesg 的信息，其中:
systemd-logind 好像有点问题，对吧？
gdm 被杀死？
nmbd 进程无法启动？我把 samba 给删了的。。。
各位，还能从这里看出什么问题不能？

谢谢了。

代码: 
[   31.662523] init: gdm main process (2613) killed by TERM signal 
[   35.843633] init: Failed to spawn nmbd main process: unable to execute: No such file or directory 
[   35.990697] init: plymouth-upstart-bridge main process ended, respawning 
[   36.325536] systemd-logind[2062]: Failed to start unit  user@111.service : Unknown unit:  user@111.service 
[   36.325543] systemd-logind[2062]: Failed to start user service: Unknown unit:  user@111.service 
[   36.328918] systemd-logind[2062]: New session c1 of user lightdm. 
[   36.328935] systemd-logind[2062]: Linked /tmp/.X11-unix/X0 to /run/user/111/X11-display. 
[   43.344674] systemd-logind[2062]: Failed to start unit  user@1000.service : Unknown unit:  user@1000.service 
[   43.344681] systemd-logind[2062]: Failed to start user service: Unknown unit:  user@1000.service 
[   43.349577] systemd-logind[2062]: New session c2 of user wyn. 
[   43.349593] systemd-logind[2062]: Linked /tmp/.X11-unix/X0 to /run/user/1000/X11-display. 
[   55.057878] audit: type=1400 audit(1414195175.782:41): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=3634 comm="apparmor_parser" 
[   55.057887] audit: type=1400 audit(1414195175.782:42): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=3634 comm="apparmor_parser" 
[   55.070040] audit: type=1400 audit(1414195175.798:43): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="third_party" pid=3634 comm="apparmor_parser" 
[   96.318683] systemd-timedated[3855]: /etc/localtime should be a symbolic link to a timezone data file in /usr/share/zoneinfo/. 
[  234.252004] chrome[3998]: segfault at 1f8 ip 00007f3a8912163f sp 00007fffb6a9c0e0 error 4 in i965_dri.so[7f3a88dce000+51c000] 
[  234.655106] chrome[4095]: segfault at 1f8 ip 00007fb70e93363f sp 00007fff0b20e0f0 error 4 in i965_dri.so[7fb70e5e0000+51c000] 
[  234.697923] chrome[4103]: segfault at 1f8 ip 00007f1dc283363f sp 00007fffe30bc5d0 error 4 in i965_dri.so[7f1dc24e0000+51c000] 
[ 6327.911360] systemd-logind[2062]: Power key pressed. 
[ 6329.057202] compiz[3319]: segfault at 75 ip 00007fd6524491c0 sp 00007fff219e6938 error 4 in libnux-core-4.0.so.0.7.0[7fd652406000+4e000]

另，启动时，好像有提示: failed