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Ubuntu 20.04: No module named 'distro'

See original GitHub issue

On a fresh ubuntu 20.04 install the run.py fails with missing module distro. You should install python3-distro first: apt install python3-distro

Impacted versions

Distribution: Ubuntu
Codename: Focal

Steps to reproduce

fresh install, than run:

python3 run.py --stop-after-configfile-check domain.hu

Full trace using --debug option or current behaviour

Traceback (most recent call last):
  File "/usr/src/modoboa-installer/modoboa_installer/utils.py", line 80, in dist_info
    import distro
ModuleNotFoundError: No module named 'distro'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "run.py", line 13, in <module>
    from modoboa_installer import package
  File "/usr/src/modoboa-installer/modoboa_installer/package.py", line 105, in <module>
    backend = get_backend()
  File "/usr/src/modoboa-installer/modoboa_installer/package.py", line 93, in get_backend
    distname = utils.dist_name()
  File "/usr/src/modoboa-installer/modoboa_installer/utils.py", line 94, in dist_name
    name, version, _id = dist_info()
  File "/usr/src/modoboa-installer/modoboa_installer/utils.py", line 85, in dist_info
    return platform.linux_distribution()
AttributeError: module 'platform' has no attribute 'linux_distribution'