Importerror: No Named '_Tkinter', Please Install the Python3-Tk Package

sudo apt-get install python3-tk Installs tkinter for Python3.x.x

Sources:

For a python 3.6 virtual environment with Python 3.5 as the "system" python (Ubuntu) , I had to install tk 3.6 to match;

sudo apt-get install python3.6-tk

My default python in ubuntu was 3.5, so when using a venv for 3.6, I would get an import error. Drove me crazy for a while.

[Edit: As this question ages]

In general, it seems if one is using a virtual environment with a python of a different version than that of ones base machine, one must install tk for the version of python used in the virtual environment.

sudo apt install python3.x-tk

Where 3.x would match the version of the virtual environment.

[Edit]

It may be necessary to add the repository for tk. In my experience, it was the same repository from which I pulled python3.6, but that may change with time;

sudo add-apt-repository ppa:deadsnakes/ppa

In my case, I was getting the same error as "ImportError: No module named '_tkinter'" for python3.5 in-spite of doing the following things: - Installing python3-tk and tkinter-dev - Tkinter directory being available in /usr/lib/python3.5.

The observed error was from the following file:

File "/usr/local/lib/python3.5/tkinter/init.py", line 35, in import _tkinter # If this fails your Python may not be configured for Tk

However, when I simply ran the python from /usr/bin like /usr/bin/python3.5 from terminal, it worked for me!

In short, just ensure the python version being run from terminal has the tkinter installed and configured :)

I have Ubuntu16.04 installed on my system which comes with default python2.7 and python3.5

This might be interesting when installing from source (which most python users won't):

After installing tcl and tk.

Go back to your version of Python, do make. And, if multiple version of python exist, do a make altinstall.

1. Open Python3.5

2. type:

   import tkinter
   tkinter._test()
   

3. results OK - pop GUI opened and working as expected.

Installing just library files may not work since you want to use library itself not develop it.

This worked for me:

$ sudo apt install tk8.6-dev