In article <52B63C0F.2080205 at ncf.ca>,
Ubuntu chooses to package tkinter separately from Python, giving you the
option to not have to pull in Tcl, Tk, and all of their dependencies if
you don't need them. Try installing the python3-tk package, for example:

sudo apt-get install python3-tk

Typically what I do in such a case is go into the interactive Python
interpreter, import the module, and then print it.

E.g. for Python 2.7 on OSX:

$ python
Python 2.7.6+ (2.7:313d9bb253bf, Nov 25 2013, 14:05:28)
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
import tkinter
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named tkinter
import Tkinter
Tkinter
<module 'Tkinter' from '/usr/local/lib/python2.7/lib-tk/Tkinter.pyc'>
And for 3.4:

$ python3
python3
Python 3.4.0b1 (v3.4.0b1:3405dc9a6afa, Nov 24 2013, 16:45:59)
[GCC 4.2.1 Compatible Apple LLVM 4.2 (clang-425.0.28)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
import Tkinter
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'Tkinter'
import tkinter
tkinter
<module 'tkinter' from '/usr/local/lib/python3.4/tkinter/__init__.py'>

Thank you all,