Installing/configuring Tkinter on Linux Mint 18?

[mpd]

I'm having trouble getting TKinter working.

Python 3.6.3 (default, Dec 13 2017, 17:56:50) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/tkinter/__init__.py", line 36, in <module>
    import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named '_tkinter'
>>> 

I installed python3-tk and its dependencies.

$ cat /etc/lsb-release
DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=18.2
DISTRIB_CODENAME=sonya
DISTRIB_DESCRIPTION="Linux Mint 18.2 Sonya"

Any thoughts?

Thanks