Unmet dependencies Ubuntu 12.10

Hello everybody,

im a total newbie at linux, but I like what I've seen until now on ubuntu 12.10
I was trying to install XBMC and i guess I used too many messed up command lines in the first place.

In the beginning I had at some point XBMC installed but when I clicked on the XBMC icon, nothing launched so I tried to uninstall it and re-install from the Ubuntu software center but here are the errors that shows when I try to install XBMC from the software center:

From software center

Package dependencies cannot be resolved

The following packages have unmet dependencies:

xbmc: Depends: xbmc-bin (>= 2:11.0-2~ppa1~quantal) but 2:11.0-2~ppa1~quantal is to be installed


And this is what shows when I try sudo apt-get install xbmc command:

xxx@ubuntu:~$ sudo apt-get install xbmc
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
xbmc : Depends: xbmc-bin (>= 2:11.0-2~ppa1~quantal) but it is not going to be installed
Depends: xbmc-bin (< 2:11.0-2~ppa1~quantal.1~) but it is not going to be installed
Recommends: python-qt3 but it is not installable
E: Unable to correct problems, you have held broken packages.



I would like some help.

Thanks