[Bug 1854184] [NEW] Software & Updates window freezes entirely when I open it for the first time since adding debug repositories.

[Seija Kijin]

Public bug reported:

Upon attempting to add debug repositories to apt and then opening
Software Updater, the cache loaded and then I switched to the Ubuntu
Software Tab. I then clicked the checkmark next to "software restricted
by copyright or legal issues." I then clicked the Close button, and then
the reload button.

The window that shows the reload process became stuck and would not be
dismissed, softlocking me in the update-manager app and forcing me to
kill the application.

Expected Results:
Software Update applies the changes without issue and then quits, or throws and error if that is not possible and I made a mistake

Actual Results:
Software Update manager hangs ans softlocks me into forcing me to kill the process.

Prior to the issue occurring, I ran "echo -e "deb
http://ddebs.ubuntu.com $(lsb_release -cs)-updates main restricted
universe multiverse\ndeb http://ddebs.ubuntu.com $(lsb_release
-cs)-proposed main restricted universe multiverse" | sudo tee -a
/etc/apt/sources.list.d/ddebs.list" and then opened Software Update
manager. I was attempting to follow the steps to debug on this URL:
https://wiki.ubuntu.com/DebuggingProgramCrash

However, I skipped the first step in adding the debug repositories and
added the one in the second step before opening Software & Updates.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: update-manager 1:19.04.8
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 27 11:46:27 2019
GsettingsChanges:
 b'com.ubuntu.update-manager' b'window-width' b'645'
 b'com.ubuntu.update-manager' b'launch-count' b'4'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1574872075'
InstallationDate: Installed on 2019-11-20 (6 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.apport.crashdb.conf: 2019-11-24T17:17:29.098099

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


** Tags: amd64 apport-bug eoan

** Attachment added: "Image of the program's UI, which is in a state preventing me from quitting."
   https://bugs.launchpad.net/bugs/1854184/+attachment/5308193/+files/Screenshot%20from%202019-11-27%2011-56-14.png

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https://bugs.launchpad.net/bugs/1854184

Title:
  Software & Updates window freezes entirely when I open it for the
  first time since adding debug repositories.

Status in update-manager package in Ubuntu:
  New

Bug description:
  Upon attempting to add debug repositories to apt and then opening
  Software Updater, the cache loaded and then I switched to the Ubuntu
  Software Tab. I then clicked the checkmark next to "software
  restricted by copyright or legal issues." I then clicked the Close
  button, and then the reload button.

  The window that shows the reload process became stuck and would not be
  dismissed, softlocking me in the update-manager app and forcing me to
  kill the application.

  Expected Results:
  Software Update applies the changes without issue and then quits, or throws and error if that is not possible and I made a mistake

  Actual Results:
  Software Update manager hangs ans softlocks me into forcing me to kill the process.

  Prior to the issue occurring, I ran "echo -e "deb
  http://ddebs.ubuntu.com $(lsb_release -cs)-updates main restricted
  universe multiverse\ndeb http://ddebs.ubuntu.com $(lsb_release
  -cs)-proposed main restricted universe multiverse" | sudo tee -a
  /etc/apt/sources.list.d/ddebs.list" and then opened Software Update
  manager. I was attempting to follow the steps to debug on this URL:
  https://wiki.ubuntu.com/DebuggingProgramCrash

  However, I skipped the first step in adding the debug repositories and
  added the one in the second step before opening Software & Updates.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: update-manager 1:19.04.8
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Nov 27 11:46:27 2019
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'window-width' b'645'
   b'com.ubuntu.update-manager' b'launch-count' b'4'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'launch-time' b'int64 1574872075'
  InstallationDate: Installed on 2019-11-20 (6 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.apport.crashdb.conf: 2019-11-24T17:17:29.098099

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