Impossible to install the plugin on Ubuntu 20.04

Full installation log:

$ hp-plugin -i

HP Linux Imaging and Printing System (ver. 3.20.3)
Plugin Download and Install Utility ver. 2.1

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

HP Linux Imaging and Printing System (ver. 3.20.3)
Plugin Download and Install Utility ver. 2.1

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

(Note: Defaults for each question are maked with a '*'. Press <enter> to accept the default.)

-----------------------------------------
| PLUG-IN INSTALLATION FOR HPLIP 3.20.3 |
-----------------------------------------

  Option Description
  ---------- --------------------------------------------------
  d Download plug-in from HP (recommended)
  p Specify a path to the plug-in (advanced)
  q Quit hp-plugin (skip installation)

Enter option (d=download*, p=specify path, q=quit) ? d

-------------------
| DOWNLOAD PLUGIN |
-------------------

Checking for network connection...
Downloading plug-in from:
Downloading plug-in: [\ ] 0% Traceback (most recent call last):
  File "/usr/bin/hp-plugin", line 363, in <module>
    status, plugin_path, error_str = pluginObj.download(plugin_path, plugin_download_callback)
  File "/usr/share/hplip/installer/pluginhandler.py", line 254, in download
    core = core_install.CoreInstall()
  File "/usr/share/hplip/installer/core_install.py", line 239, in __init__
    self.passwordObj = password.Password(ui_mode)
  File "/usr/share/hplip/base/password.py", line 88, in __init__
    self.__readAuthType() # self.__authType
  File "/usr/share/hplip/base/password.py", line 110, in __readAuthType
    distro_name = get_distro_name().lower()
  File "/usr/share/hplip/base/password.py", line 78, in get_distro_name
    return distro.linux_distribution(full_distribution_name=False)[0]
  File "/usr/lib/python3/dist-packages/distro.py", line 122, in linux_distribution
    return _distro.linux_distribution(full_distribution_name)
  File "/usr/lib/python3/dist-packages/distro.py", line 677, in linux_distribution
    self.version(),
  File "/usr/lib/python3/dist-packages/distro.py", line 737, in version
    self.lsb_release_attr('release'),
  File "/usr/lib/python3/dist-packages/distro.py", line 899, in lsb_release_attr
    return self._lsb_release_info.get(attribute, '')
  File "/usr/lib/python3/dist-packages/distro.py", line 552, in __get__
    ret = obj.__dict__[self._fname] = self._f(obj)
  File "/usr/lib/python3/dist-packages/distro.py", line 1012, in _lsb_release_info
    stdout = subprocess.check_output(cmd, stderr=devnull)
  File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.8/subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '('lsb_release', '-a')' returned non-zero exit status 1.
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 144, in apport_excepthook
    with os.fdopen(os.open(pr_filename,
PermissionError: [Errno 13] Permission denied: '/var/crash/_usr_share_hplip_plugin.py.1000.crash'

Original exception was:
Traceback (most recent call last):
  File "/usr/bin/hp-plugin", line 363, in <module>
    status, plugin_path, error_str = pluginObj.download(plugin_path, plugin_download_callback)
  File "/usr/share/hplip/installer/pluginhandler.py", line 254, in download
    core = core_install.CoreInstall()
  File "/usr/share/hplip/installer/core_install.py", line 239, in __init__
    self.passwordObj = password.Password(ui_mode)
  File "/usr/share/hplip/base/password.py", line 88, in __init__
    self.__readAuthType() # self.__authType
  File "/usr/share/hplip/base/password.py", line 110, in __readAuthType
    distro_name = get_distro_name().lower()
  File "/usr/share/hplip/base/password.py", line 78, in get_distro_name
    return distro.linux_distribution(full_distribution_name=False)[0]
  File "/usr/lib/python3/dist-packages/distro.py", line 122, in linux_distribution
    return _distro.linux_distribution(full_distribution_name)
  File "/usr/lib/python3/dist-packages/distro.py", line 677, in linux_distribution
    self.version(),
  File "/usr/lib/python3/dist-packages/distro.py", line 737, in version
    self.lsb_release_attr('release'),
  File "/usr/lib/python3/dist-packages/distro.py", line 899, in lsb_release_attr
    return self._lsb_release_info.get(attribute, '')
  File "/usr/lib/python3/dist-packages/distro.py", line 552, in __get__
    ret = obj.__dict__[self._fname] = self._f(obj)
  File "/usr/lib/python3/dist-packages/distro.py", line 1012, in _lsb_release_info
    stdout = subprocess.check_output(cmd, stderr=devnull)
  File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.8/subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '('lsb_release', '-a')' returned non-zero exit status 1.

By the way:
$ python3 -c 'print(__import__("distro").linux_distribution(full_distribution_name=False))'
('ubuntu', '20.04', 'focal')