There was an error starting the GNOME Settings Daemon

There was an error starting the GNOME Settings Daemon.
Some things, such as themes, sounds, or background settings may not work correctly.
The last error message was:
Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
GNOME will still try to restart the Settings Daemon next time you log in.

덕분에 1시간가량 삽질을 한듯 ...
이유야 여러가지가 있겠지만, 아래와 같이 해결!!

login to a failsafe terminal
$ vi /etc/network/interfaces

Make sure the following lines are in there, and that they arent commented out:

auto lo
iface lo inet loopback

Also, comment out anything involving IPv6 if you dont use it.

then:

$ sudo ifconfig lo up
$ exit

Reboot your box and your good to go. Dont forget to change your session back to Gnome!

참고 : 해당 파일에서 ip setting을 정상적으로 해주면서 해결!!!