Can't import matplotlib #12601

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.7/site-packages/matplotlib/__init__.py", line 1080, in <module>
    rcParamsOrig = RcParams(rcParams.copy())
  File "/usr/lib/python3.7/site-packages/matplotlib/__init__.py", line 870, in __getitem__
    from matplotlib import pyplot as plt
  File "/usr/lib/python3.7/site-packages/matplotlib/pyplot.py", line 33, in <module>
    import matplotlib.image
  File "/usr/lib/python3.7/site-packages/matplotlib/image.py", line 18, in <module>
    from matplotlib.backend_bases import FigureCanvasBase
  File "/usr/lib/python3.7/site-packages/matplotlib/backend_bases.py", line 46, in <module>
    from matplotlib import (
ImportError: cannot import name 'get_backend' from 'matplotlib' (/usr/lib/python3.7/site-packages/matplotlib/__init__.py)