Software-properties-gtk won´t start anymore

Traceback (most recent call last):
File “/usr/bin/software-properties-gtk”, line 100, in
app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
File “/usr/lib/python3/dist-packages/softwareproperties/gtk/”, line 116, in init
SoftwareProperties.init(self, options=options, datadir=datadir)
File “/usr/lib/python3/dist-packages/softwareproperties/”, line 117, in init
File “/usr/lib/python3/dist-packages/softwareproperties/”, line 612, in reload_sourceslist
File “/usr/lib/python3/dist-packages/aptsources/”, line 93, in get_sources
(, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Zorin/bionic
What`s problem?

Can you try:

  1. Zorin Menu -> System Tools -> Software Updater -> Settings to see if you can access using this way?
  2. Reinstall the package with Synaptic?

Nothing helps

Also reinstall, python3-software-properties. If that doesn’t fix it, do the same for software-properties-common.
Is this a new install? Did Software Updater run successfully in the past?