# apt-get install x11-common
Reading package lists... Done
Building dependency tree... Done
The following NEW packages will be installed:
  x11-common
0 upgraded, 1 newly installed, 0 to remove and 958 not upgraded.
58 not fully installed or removed.
Need to get 0B/291kB of archives.
After unpacking 598kB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously deselected package x11-common.
(Reading database ... 138021 files and directories currently installed.)
Unpacking x11-common (from .../x11-common_1%3a7.1.1ubuntu6_i386.deb) ...
rmdir: /usr/X11R6/bin: Directory not empty
dpkg: error processing /var/cache/apt/archives/x11-common_1%3a7.1.1ubuntu6_i386.deb (--unpack):
 subprocess pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/x11-common_1%3a7.1.1ubuntu6_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)