[Bug 2092344] [NEW] Settings does not work

[Brian Vargo]

Public bug reported:

click on the settings button to disable checking and notifications in
lieu of `apt remove update-manager-common` and the wheel spins but no
settings come up.

this does though:
```
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 274, in __init__
    self.init_distro()
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 492, in init_distro
    eol_date = distro.eol
               ^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'eol'
```

I'm running Rhino Linux and pulled update-manager: version 25.04.2 out of the Plucky repo:
/var/log/dpkg.log.1:2024-11-22 07:59:59 status installed update-manager:all 1:25.04.2

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2092344

Title:
  Settings does not work

Status in update-manager package in Ubuntu:
  New

Bug description:
  click on the settings button to disable checking and notifications in
  lieu of `apt remove update-manager-common` and the wheel spins but no
  settings come up.

  this does though:
  ```
  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 274, in __init__
      self.init_distro()
    File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 492, in init_distro
      eol_date = distro.eol
                 ^^^^^^^^^^
  AttributeError: 'NoneType' object has no attribute 'eol'
  ```

  I'm running Rhino Linux and pulled update-manager: version 25.04.2 out of the Plucky repo:
  /var/log/dpkg.log.1:2024-11-22 07:59:59 status installed update-manager:all 1:25.04.2

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