Tkinter module not found

The python package tkinter not available?
user:~/catkin_ws/src/mathsrobotics/unit2_exercises$ /usr/bin/python3 /home/user/catkin_ws/src/mathsrobotics/unit2_exercises/
Traceback (most recent call last):
File “/home/user/catkin_ws/src/mathsrobotics/unit2_exercises/”, line 1, in
import matplotlib.pyplot as plt
File “/usr/lib/python3/dist-packages/matplotlib/”, line 2349, in
File “/usr/lib/python3/dist-packages/matplotlib/”, line 221, in switch_backend
backend_mod = importlib.import_module(backend_name)
File “/usr/lib/python3.8/importlib/”, line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “/usr/lib/python3/dist-packages/matplotlib/backends/”, line 1, in
from . import _backend_tk
File “/usr/lib/python3/dist-packages/matplotlib/backends/”, line 6, in
import tkinter as tk
ModuleNotFoundError: No module named ‘tkinter’

I apologize for this glitch. You can fix that error temporarily by running:

sudo apt-get install python3-tk

We will fix permanently this in the VMs.