Description of problem:
I am trying to run the Python program that requires Tkinter. Tkinter is not installed by default but can be installed from repository via Applications -> Add/Remove the software. However after this installation the program I try to use still complains that it is not available and the error message seems coming from the Python Tkinter wrapper itself:

Traceback (most recent call last):
  File "/usr/local/bin/tkpftf", line 8, in <module>
    load_entry_point('pftf==1.0', 'console_scripts', 'tkpftf')()
  File "/usr/local/lib/python2.5/site-packages/setuptools-0.6c3-py2.5.egg/pkg_resources.py", line 236, in load_entry_point
  File "/usr/local/lib/python2.5/site-packages/setuptools-0.6c3-py2.5.egg/pkg_resources.py", line 2097, in load_entry_point
  File "/usr/local/lib/python2.5/site-packages/setuptools-0.6c3-py2.5.egg/pkg_resources.py", line 1830, in load
  File "/usr/local/lib/python2.5/site-packages/pftf-1.0-py2.5.egg/pftf/timekeeper.py", line 12, in <module>
    import Tkinter
  File "/usr/local/lib/python2.5/lib-tk/Tkinter.py", line 38, in <module>
    import _tkinter # If this fails your Python may not be configured for Tk
ImportError: No module named _tkinter

Version-Release number of selected component (if applicable):
python --version
Python 2.5.4

How reproducible:
Try to install and run the GUI of the tiny python program that can be found http://freshmeat.net/projects/pftf. The GUI is called tkpftf
. Exactly the same error message is produced.
  
Actual results:
The program that uses Tkinter.py starts after I add Tkinter in the package manager.

Expected results:
The program that uses Tkinter.py crashes complaining that Python is not configured for it.

Additional info:
Rebooting does not fix this.