[Bug 1728245] [NEW] [software-properties-gtk] Cannot enable/disable PPAs - checkmark button non-responsive

[The Bright Side]

Public bug reported:

Steps to Reproduce:
1. Launch software-properties-gtk on Ubuntu 17.10 (Xorg)
2. Select "Other Software" tab
3. Click on checkmark to the left of any PPA (e.g. Ubuntu Partners)

Current Behaviour:
When clicking the checkmark to enable or disable a PPA, the window becomes inactive (greyed out). Clicking on the title bar bring the window back into focus.

Expected Behaviour:
A password prompt should pop up. Then, the PPA should be enabled/disabled when clicking the button.

Repro Rate: 90%
In 17.04, after a while, this started working on its own.
In 17.10, it won't work.

Notes:
>From my memory, this has been happening at least since Ubuntu GNOME 17.04, and is happening in 17.10.
Workaround: gksu software-properties-gtk does the trick.
It seems the issue is that software-properties-gtk doesn't trigger the password prompt.

See the bug in action:
https://youtu.be/ke6ZR6aKrQ0

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1728245

Title:
  [software-properties-gtk] Cannot enable/disable PPAs - checkmark
  button non-responsive

Status in software-properties package in Ubuntu:
  New

Bug description:
  Steps to Reproduce:
  1. Launch software-properties-gtk on Ubuntu 17.10 (Xorg)
  2. Select "Other Software" tab
  3. Click on checkmark to the left of any PPA (e.g. Ubuntu Partners)

  Current Behaviour:
  When clicking the checkmark to enable or disable a PPA, the window becomes inactive (greyed out). Clicking on the title bar bring the window back into focus.

  Expected Behaviour:
  A password prompt should pop up. Then, the PPA should be enabled/disabled when clicking the button.

  Repro Rate: 90%
  In 17.04, after a while, this started working on its own.
  In 17.10, it won't work.

  Notes:
  From my memory, this has been happening at least since Ubuntu GNOME 17.04, and is happening in 17.10.
  Workaround: gksu software-properties-gtk does the trick.
  It seems the issue is that software-properties-gtk doesn't trigger the password prompt.

  See the bug in action:
  https://youtu.be/ke6ZR6aKrQ0

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