cannot install xfree86-common via apt

[scorpix <scorpix@gawab.com>]

I did upgrade with apt-get upgrade,
but i got error that i cant install xfree86-common, i try apt-get -f 
install and it install the other packages except xfree86-common, the 
error is:


Preparing to replace xfree86-common 4.3.0.dfsg.1-6 (using 
.../xfree86-common_4.3.0.dfsg.1-7_all.deb) ...
Document `debian-x-faq' is not installed, cannot remove.
Unpacking replacement xfree86-common ...
dpkg: error processing 
/var/cache/apt/archives/xfree86-common_4.3.0.dfsg.1-7_all.deb (--unpack):
trying to overwrite `/usr/lib/X11', which is also in package t1-cyrillic
System startup links for /etc/init.d/xfree86-common already exist.
Setting up X server socket directory /tmp/.X11-unix...done.
Setting up ICE socket directory /tmp/.ICE-unix...done.
Errors were encountered while processing:
/var/cache/apt/archives/xfree86-common_4.3.0.dfsg.1-7_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)


i use Sid.