xsystem-xorg-core is BROKEN

[Pazzeo]

Hi all,

I have a strange problem. When i try to install this packet xserver-xorg-video-unichrome, the system returns this error:

The following packages are BROKEN:
xserver-xorg-core
The following packages will be automatically REMOVED:
xserver-xorg-video-via
The following NEW packages will be installed:
xserver-xorg-video-unichrome
The following packages will be REMOVED:
xserver-xorg-video-via
0 packages upgraded, 1 newly installed, 1 to remove and 0 not upgraded.
Need to get 85.5kB of archives. After unpacking 213kB will be freed.
The following packages have unmet dependencies:
xserver-xorg-core: Conflicts: xserver-xorg-video-1.0 which is a virtual package.
Resolving dependencies...
The following actions will resolve these dependencies:

Keep the following packages at their current version:
xserver-xorg-video-unichrome [Not Installed]

Score is -9881

Accept this solution? [Y/n/q/?] q
Abandoning all efforts to resolve these dependencies.
Abort.

How can I solve the xorg-core BROKEN??
Help me i can't format the pc... :)

Thank you

Pazzeo