maemo.org - Talk - python-tk = Incompatible Application Package

a python code requires python-tk to run.

so i go to x-term and type

root
apt-get install python-tk

and i get the following

Code:

Nokia-N900:~# apt-get install python-tk 

Reading package lists... Done 

Building dependency tree 

Reading state information... Done 

Package python-tk is not available, but is referred to by another package. 

This may mean that the package is missing, has been obsoleted, or 

is only available from another source 

However the following packages replace it: 

python2.5 

E: Package python-tk has no installation candidate

knowing i already have python2.5, i give this a try
apt-get install python2.5

and it says its installed.

so how do i go about installing this python-tk.

i downloaded this package from here and tried to open it via file manager and i get the error "Incompatible Application Package"

Help please.