[Bug 1902538] Re: Ubuntu Mate 21.04 Software & Updates fails to run

[Norbert]

Launching from the terminal gives the following output:

```
$ software-properties-gtk 
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 100, in <module>
    app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 154, in __init__
    SoftwareProperties.__init__(self, options=options, datadir=datadir)
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 111, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 605, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)    
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 91, in get_sources
    raise NoDistroTemplateException(
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Ubuntu/hirsute

```

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https://bugs.launchpad.net/bugs/1902538

Title:
  Ubuntu Mate 21.04 Software & Updates fails to run

Status in Ubuntu MATE:
  New
Status in software-properties package in Ubuntu:
  New

Bug description:
  When trying to open "Software & Updates" it shows in the dock, but
  fails to run. I realize that now I am unable to restore packages that
  were disabled during the install.

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