Error instaling xserver-xfree86 !!

[Paladin <paladin@paladin.dhis.org>]

Hi,

With the objective of changing a fs from ext3 to reiserfs, I've
managed to loose all the /usr files (tar seems to have failed the
backup! :/). So, after a great amount of work I have the system
almost working, but I have this problem with xserver-xfree86
package:


Reading Package Lists... Done
Building Dependency Tree... Done
The following NEW packages will be installed:
  xserver-xfree86 
0 packages upgraded, 1 newly installed, 0 to remove and 0  not
upgraded.
Need to get 0B/3995kB of archives. After unpacking 11.5MB will be
used.
Preconfiguring packages ...
(Reading database ... 47074 files and directories currently
installed.)
Unpacking xserver-xfree86 (from
.../xserver-xfree86_4.2.1-3_i386.deb) ...
dpkg: error processing
/var/cache/apt/archives/xserver-xfree86_4.2.1-3_i386.deb (--unpack):
 unable to create `./usr/X11R6/lib/modules/extensions/libGLcore.a':
No such file or directory
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/xserver-xfree86_4.2.1-3_i386.deb
localepurge: checking for new locale files ...
localepurge: processing locale files ...
localepurge: processing man pages ...
E: Sub-process /usr/bin/dpkg returned an error code (1)

I used dpkg-deb -x to extract the files so that I can use X, but
still I'm having troubles installing packages because of unmet
dependencies... Any help would be welcome!

Thanks,

---
Paladin