root@customers2:~# apt-get install xvfb
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 linux-server : Depends: linux-headers-server (= 3.2.0.65.77) but 3.2.0.67.79 is to be installed
 xvfb : Depends: xserver-common (>= 2:1.11.4-0ubuntu10.17) but it is not going to be installed
        Depends: libpixman-1-0 (>= 0.30.0) but it is not going to be installed
        Depends: libxfont1 (>= 1:1.4.2) but it is not going to be installed
        Depends: x11-xkb-utils but it is not going to be installed
        Recommends: libgl1-mesa-dri
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
root@customers2:~# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/customers2-root   99G  5.9G   88G   7% /
udev                         1.5G  4.0K  1.5G   1% /dev
tmpfs                        603M  256K  603M   1% /run
none                         5.0M     0  5.0M   0% /run/lock
none                         1.5G     0  1.5G   0% /run/shm
/dev/sda1                    228M  225M     0 100% /boot
root@customers2:~# uname -r
3.2.0-23-generic