[Python] pyenv install: 3.x BUILD FAILED (Ubuntu 20.04 using python-build 20180424)

Trying to install a new Python - version with pyenv on Ubuntu 20.04 WSL for Windows 10 fails with the following output:

username@hd1pcms0347:~$ pyenv install 3.9.4
Downloading Python-3.9.4.tar.xz...
-> https://www.python.org/ftp/python/3.9.4/Python-3.9.4.tar.xz
Installing Python-3.9.4...
python-build: use readline from homebrew

BUILD FAILED (Ubuntu 20.04 using python-build 20180424)

Inspect or clean up the working tree at /tmp/python-build.20210602162502.2268
Results logged to /tmp/python-build.20210602162502.2268.log

Last 10 log lines:
File "/tmp/python-build.20210602162502.2268/Python-3.9.4/Lib/ensurepip/__init__.py", line 210, in _main
return _bootstrap(
File "/tmp/python-build.20210602162502.2268/Python-3.9.4/Lib/ensurepip/__init__.py", line 129, in _bootstrap
return _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
File "/tmp/python-build.20210602162502.2268/Python-3.9.4/Lib/ensurepip/__init__.py", line 38, in _run_pip
return subprocess.run([sys.executable, "-c", code], check=True).returncode
File "/tmp/python-build.20210602162502.2268/Python-3.9.4/Lib/subprocess.py", line 528, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/tmp/python-build.20210602162502.2268/Python-3.9.4/python', '-c', '\nimport runpy\nimport sys\nsys.path = [\'/tmp/tmp7aa5f7ml/setuptools-49.2.1-py3-none-any.whl\', \'/tmp/tmp7aa5f7ml/pip-20.2.3-py2.py3-none-any.whl\'] + sys.path\nsys.argv[1:] = [\'install\', \'--no-cache-dir\', \'--no-index\', \'--find-links\', \'/tmp/tmp7aa5f7ml\', \'--root\', \'/\', \'--upgrade\', \'setuptools\', \'pip\']\nrunpy.run_module("pip", run_name="__main__", alter_sys=True)\n']' returned non-zero exit status 1.
make: *** [Makefile:1255: install] Error 1


EDIT: I had shared the log file earlier via GoogleDrive so that @Marlon Richert could give his nice answer based on its contents.

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