14.04 업데이트 후 해상도 문제

10일만에 첨터를 키고 어제 업데이트했는데 해상도가 16001200만 잡히네요
아래보면 Failed 나오는것 때문인지 1920
1200 잡기긴 하는데 적용이 안되네요
어떻게 해야 할까요?

root@ubuntu144:/home/ubuntu144# xrandr --newmode "1920x1200_60.00" 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync
xrandr: Failed to get size of gamma for output default
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 19
Current serial number in output stream: 19
root@ubuntu144:/home/ubuntu144# xrandr --output default --mode "1920x1200_60.00"
xrandr: cannot find mode 1920x1200_60.00
root@ubuntu144:/home/ubuntu144# xrandr --addmode default "1920x1200_60.00"
xrandr: Failed to get size of gamma for output default
root@ubuntu144:/home/ubuntu144# xrandr --addmode default "1920x1200_60.00"
xrandr: Failed to get size of gamma for output default
root@ubuntu144:/home/ubuntu144# xrandr --output default --mode "1920x1200_60.00"
xrandr: Failed to get size of gamma for output default
xrandr: Configure crtc 0 failed

dpkg --configure -a 로
약 한시간 정도 하더니 정상으로 돌아왔네요