[Bug 2122357] Re: [SRU] Dialog not opening after selecting "Other" for Ubuntu Software source

[Robie Basak]

This was sponsored into Questing, but has somebody tested that it
actually works in Questing, please? If not, please could you do that?
Also:

> Expected result: A dialog opens which allows selecting a mirror.

Could you also please check that selecting a mirror actually works, ie.
that a mirror is selected (presumably in the system apt configuration,
such that "apt update" reports using the mirror and succeeds?) once the
user has chosen one? Because that's the full user story, rather than
just that the dialog appeared, and if it turns out to silently fail for
example, then that is possibly worse than not working in a way the user
at least can tell it didn't work.

I'll accept into plucky-proposed now though since the upload isn't
affected, I want to save you a review iteration cycle, and it seems
likely that it'll be fine. I would appreciate Questing and Plucky being
tested for the full user story please before releasing this into Plucky
though.

Minor comment (not worth a review iteration for): it'd be nice for the
changelog to explain what we're fixing from their perspective, eg. "Fix
apt mirror selection when using KDE/Qt".

** Changed in: software-properties (Ubuntu Plucky)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-plucky

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https://bugs.launchpad.net/bugs/2122357

Title:
  [SRU] Dialog not opening after selecting "Other" for Ubuntu Software
  source

Status in software-properties package in Ubuntu:
  Fix Released
Status in software-properties source package in Plucky:
  Fix Committed
Status in software-properties source package in Questing:
  Fix Released

Bug description:
  [Impact]

  Users are unable to select alternative mirrors under Software Sources
  for Kubuntu, Lubuntu, and Ubuntu Studio which use software-properties-
  qt. As it turns out, this is because DialogMirror.py was never ported
  to Qt6.

  [Test Plan]

  Steps to reproduce.

  1) Go to "Software Sources"
  2) Go to "Ubuntu Software" tab
  3) On the "Download from:" field select the option "Other..." in the dropdown.

  Expected result: A dialog opens which allows selecting a mirror.
  Actual result: "Software Sources" tab freezes for ~1 second and the dialog is not opened.

  [What problems could occur]

  There may be more issues that could occur, such as other fields being
  incomplete, but this has been well-tested.

  [Original Report Information]

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: software-properties-qt 0.111
  Uname: Linux 6.16.3-061603-generic x86_64
  ApportVersion: 2.32.0-0ubuntu5.3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Mon Sep  8 20:53:22 2025
  InstallationDate: Installed on 2025-08-07 (32 days ago)
  InstallationMedia: Kubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
  PackageArchitecture: all
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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