root@armadillo:~# pip install matplotlib==3.4.0
Collecting matplotlib==3.4.0
  Downloading matplotlib-3.4.0.tar.gz (37.1 MB)
     qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq 37.1/37.1 MB 419.5 kB/s eta 0:00:00
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  �~ python setup.py egg_info did not run successfully.
  x exit code: 1
  mq> [79 lines of output]
      Traceback (most recent call last):
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 154, in save_modules
          yield saved
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 195, in setup_context
          yield
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 250, in run_setup
          _execfile(setup_script, ns)
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 45, in _execfile
          exec(code, globals, locals)
        File "/tmp/easy_install-8mwywrdq/numpy-1.26.0b1/setup.py", line 22, in <module>
          """.format('.'.join(str(n) for n in since_mpl_version),
      RuntimeError: Python version >= 3.9 required.

      During handling of the above exception, another exception occurred:

      Traceback (most recent call last):
        File "<string>", line 36, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-xb2wvwu7/matplotlib_f0b4b610dbba434083ecdcb5fa248543/setup.py", line 314, in <module>
          cmdclass=cmdclass,
        File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 144, in setup
          _install_setup_requires(attrs)
        File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 139, in _install_setup_requires
          dist.fetch_build_eggs(dist.setup_requires)
        File "/usr/lib/python3/dist-packages/setuptools/dist.py", line 724, in fetch_build_eggs
          replace_conflicting=True,
        File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 782, in resolve
          replace_conflicting=replace_conflicting
        File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1065, in best_match
          return self.obtain(req, installer)
        File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1077, in obtain
          return installer(requirement)
        File "/usr/lib/python3/dist-packages/setuptools/dist.py", line 791, in fetch_build_egg
          return cmd.easy_install(req)
        File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 704, in easy_install
          return self.install_item(spec, dist.location, tmpdir, deps)
        File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 730, in install_item
          dists = self.install_eggs(spec, download, tmpdir)
        File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 915, in install_eggs
          return self.build_and_install(setup_script, setup_base)
        File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 1183, in build_and_install
          self.run_setup(setup_script, setup_base, args)
        File "/usr/lib/python3/dist-packages/setuptools/command/easy_install.py", line 1169, in run_setup
          run_setup(setup_script, args)
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 253, in run_setup
          raise
        File "/usr/lib/python3.7/contextlib.py", line 130, in __exit__
          self.gen.throw(type, value, traceback)
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 195, in setup_context
          yield
        File "/usr/lib/python3.7/contextlib.py", line 130, in __exit__
          self.gen.throw(type, value, traceback)
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 166, in save_modules
          saved_exc.resume()
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 141, in resume
          six.reraise(type, exc, self._tb)
        File "/usr/lib/python3/dist-packages/setuptools/_vendor/six.py", line 685, in reraise
          raise value.with_traceback(tb)
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 154, in save_modules
          yield saved
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 195, in setup_context
          yield
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 250, in run_setup
          _execfile(setup_script, ns)
        File "/usr/lib/python3/dist-packages/setuptools/sandbox.py", line 45, in _execfile
          exec(code, globals, locals)
        File "/tmp/easy_install-8mwywrdq/numpy-1.26.0b1/setup.py", line 22, in <module>
          """.format('.'.join(str(n) for n in since_mpl_version),
      RuntimeError: Python version >= 3.9 required.

      Edit setup.cfg to change the build options; suppress output with --quiet.

      BUILDING MATPLOTLIB
        matplotlib: yes [3.4.0]
            python: yes [3.7.3 (default, Jun 29 2023, 18:03:57)  [GCC 8.3.0]]
          platform: yes [linux]
             tests: no  [skipping due to configuration]
            macosx: no  [Mac OS-X only]

      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

�~ Encountered error while generating package metadata.
mq> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.