ImportError: No module named _tkinter

I'm using ubuntu11.10 and python2.7.2 .

A weird error:

File "/usr/local/lib/python2.7/lib-tk/Tkinter.py", line 39, in 
import _tkinter # If this fails your Python may not be configured for Tk
ImportError: No module named _tkinter


But Tk was already installed in my computer...

$ sudo apt-get install python-tkReading package lists...Done
Building dependency tree       Reading state information...Done
python-tk is already the newest version.
0 upgraded,0 newly installed,0 to remove and0not upgraded.

It may be the problem of having two different versions of python installed in the computer.

Solution:
sudo ln -f /usr/bin/python2.7 /usr/local/bin/python

Reference: http://www.python-forum.org/pythonforum/viewtopic.php?f=17&t=21923