xserver-xorg-core (2:1.11.4-0ubuntu10.8) breaks xserver-xorg-video-5 and is installed.

Also I can not upgrade my software, It said that the package system is broken, with detail information:

The following packages have unmet dependencies:

xserver-xorg-core: Depends: xserver-common (>= 2:1.11.4-0ubuntu10.8) but 2:1.11.4-0ubuntu10.8 is installed

when I issue sudo apt-get update, the output seems fine the source is(sorry the output has too many links that I can not post in);http://archive.ubuntu.com

Reading package lists... Done

======================

when I issue sudo apt-get dist-upgrade, the output is:

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:
 xserver-xorg-core : Breaks: xserver-xorg-video-5
E: Unmet dependencies. Try using -f.

================== when I issue 'sudo apt-get -f install', the output is: dpkg: dependency problems prevent configuration of xserver-xorg-video-radeon: xserver-xorg-core (2:1.11.4-0ubuntu10.8) breaks xserver-xorg-video-5 and is installed.
xserver-xorg-video-radeon (1:6.12.1-0ubuntu2) provides xserver-xorg-video-5. dpkg: error processing xserver-xorg-video-radeon (--configure):dependency problems leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: xserver-xorg-video-radeon E: Sub-process /usr/bin/dpkg returned an error code (1)