No module named apt_pkg

Had this error while trying to install Lutris :sudo add-apt-repository ppa:lutris-team/lutris and then this came out :

 Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 11, in <module>
    from softwareproperties.SoftwareProperties import SoftwareProperties, shortcut_handler
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 28, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

Seems like the problem is something about python?

ln -s /usr/lib/python3/dist-packages/apt_pkg.cpython-36m-x86_64-linux-gnu.so /usr/lib/python3/dist-packages/apt_pkg.so