[Bug 1058072] Re: Cancelling PolicyKit authorization produces silly error message

[Matthew Paul Thomas]

Edward, thanks for that work, and I'm sorry I didn't see it at the time
(I wasn't subscribed to software-properties). Is it possible to
distinguish between the case of clicking Cancel, and the case where
PolicyKit fails for any other reason? I think we want to show an error
alert only in the latter case. And perhaps make it a RecoverableError
<https://wiki.ubuntu.com/ErrorTracker#app-requested>, so we can figure
out what's causing it, and fix root causes later on.

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https://bugs.launchpad.net/bugs/1058072

Title:
  Cancelling PolicyKit authorization produces silly error message

Status in “software-properties” package in Ubuntu:
  Triaged

Bug description:
  software-properties-gtk 0.92.6, Ubuntu Q

  1. Open Software Sources.
  2. Change anything, e.g. check/uncheck any of the checkboxes in the "Ubuntu Software" tab.
  3. In the authorization prompt, choose "Cancel".

  What happens: An error alert appears, "Authorization failed." -
  "Software sources can't be changed without permission."

  What should happen: No error alert appears. You already know that you
  cancelled the authorization.

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