First, make sure you turn off compiz - when I had it turned on it lead to all sort of weird errors and freeze-ups.
Then I downloaded the package from: http://search.cpan.org/dist/Tk/
Using Synaptic I installed: libperl-dev, libx11-dev, x-dev,and libxft-dev
Then, using the command line:
tar xvfz Tk-*
perl Makefile.PL XFT=1
sudo make install