python/plotについて、ここに記述してください。

手元のUbuntu 20.04 LTS

python3 にて

$ pip -V
pip 20.0.2 from /usr/lib/python3/dist-packages/pip (python 3.8)
tmaeno@nvme0:~$ pip install matplotlib
Collecting matplotlib
...

Installing collected packages: pyparsing, packaging, fonttools, cycler, kiwisolver, numpy, matplotlib

  WARNING: The scripts fonttools, pyftmerge, pyftsubset and ttx are installed in '/home/tmaeno/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The scripts f2py, f2py3 and f2py3.8 are installed in '/home/tmaeno/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed cycler-0.11.0 fonttools-4.28.5 kiwisolver-1.3.2 matplotlib-3.5.1 numpy-1.22.1 packaging-21.3 pyparsing-3.0.6