[Bug 1791931] Re: Update-manager crashes in _show_transaction due to packages being already removed

[Johan]

Thank You

On Thu, Sep 13, 2018 at 7:20 PM Launchpad Bug Tracker <
1791931 at bugs.launchpad.net> wrote:

> This bug was fixed in the package update-manager - 1:18.10.8
>
> ---------------
> update-manager (1:18.10.8) cosmic; urgency=medium
>
>   * Print transaction error and let the user try again applying updates
>     (LP: #1317164)
>   * Don't ask backend to do package operations aready done.
>     Aptdaemon cancels the transaction when asked to remove packages already
>     removed which results the failure being shown to the user. This
>     is unnecessary as update-manager can just filter the package
> operations to
>     be done using a fresh cache and decrease the likelyhood of hitting
>     a race condition where packages to be removed are already removed.
>     (LP: #1791931)
>
>  -- Balint Reczey <rbalint at ubuntu.com>  Tue, 11 Sep 2018 13:40:57 +0200
>
> ** Changed in: update-manager (Ubuntu)
>        Status: In Progress => Fix Released
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1763927).
> https://bugs.launchpad.net/bugs/1791931
>
> Title:
>   Update-manager crashes in _show_transaction due to packages being
>   already removed
>
> Status in update-manager package in Ubuntu:
>   Fix Released
>
> Bug description:
>   [Impact]
>
>    * Update-manager crashes when it tries to remove a package that was
>   already removed since update-manager refreshed its cache. A typical
>   scenario is when the list of available packages is updated, then
>   update-manager pops up to notify the user about the updates. The user
>   is not in front of the screen and unattended-upgrades installs the
>   security updates and removes unused kernels making the list of updates
>   shown to the user outdated. User clicks "Install now" and update-
>   manager crashes.
>
>    * The fix obtains a fresh cache and skips package operations that
>   would be obsolete and result an exception.
>
>   [Test Case ]
>
>    (with Bionic's package names)
>    * Install older kernel packages, downgrade a few packages and mark the
> kernels autoremovable:
>      $ sudo eatmydata apt install -y --allow-downgrades
> linux-headers-4.15.0-32 linux-headers-4.15.0-32-generic
> libpoppler73=0.62.0-2ubuntu2 poppler-utils=0.62.0-2ubuntu2 ; sudo
> /etc/kernel/postinst.d/apt-auto-removal ; sudo apt-mark auto
> linux-headers-4.15.0-32  linux-headers-4.15.0-32-generic
>
>    * Start update-manager in a different terminal and _don't_ start the
>   upgrade
>
>    * Remove kernel packages behind u-m's back:
>      $ sudo eatmydata apt remove -y linux-headers-4.15.0-32
>
>    * Start the update on update-manager's GUI and observe it not
>   crashing with the fixed version
>
>   [Regression Potential]
>
>    * Too eager filtering could let packages not updated/not removed, but
> the next run of update-manager would retry updating/removing them.
>    * Obtaining a fresh cache takes a ~100 milliseconds and the GUI may
> freeze for that time. For this short time u-m could show itself busy but
> IMO it would be more disturbing than the potentially not noticeable freeze.
>
>   [Original bug text]
>
>   The Ubuntu Error Tracker has been receiving reports about a problem
> regarding update-manager.  This problem was most recently seen with package
> version 1:18.04.11.4, the problem page at
> https://errors.ubuntu.com/problem/c4f194c0df19fca32a25eff8c633ad69fe9b5abb
> contains more details, including versions of packages affected, stacktrace
> or traceback, and individual crash reports.
>   If you do not have access to the Ubuntu Error Tracker and are a software
> developer, you can request it at http://forms.canonical.com/reports/.
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1791931/+subscriptions
>

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https://bugs.launchpad.net/bugs/1791931

Title:
  Update-manager crashes in _show_transaction due to packages being
  already removed

Status in update-manager package in Ubuntu:
  Fix Released

Bug description:
  [Impact]

   * Update-manager crashes when it tries to remove a package that was
  already removed since update-manager refreshed its cache. A typical
  scenario is when the list of available packages is updated, then
  update-manager pops up to notify the user about the updates. The user
  is not in front of the screen and unattended-upgrades installs the
  security updates and removes unused kernels making the list of updates
  shown to the user outdated. User clicks "Install now" and update-
  manager crashes.

   * The fix obtains a fresh cache and skips package operations that
  would be obsolete and result an exception.

  [Test Case ]

   (with Bionic's package names)
   * Install older kernel packages, downgrade a few packages and mark the kernels autoremovable:
     $ sudo eatmydata apt install -y --allow-downgrades linux-headers-4.15.0-32 linux-headers-4.15.0-32-generic libpoppler73=0.62.0-2ubuntu2 poppler-utils=0.62.0-2ubuntu2 ; sudo /etc/kernel/postinst.d/apt-auto-removal ; sudo apt-mark auto linux-headers-4.15.0-32  linux-headers-4.15.0-32-generic

   * Start update-manager in a different terminal and _don't_ start the
  upgrade

   * Remove kernel packages behind u-m's back:
     $ sudo eatmydata apt remove -y linux-headers-4.15.0-32

   * Start the update on update-manager's GUI and observe it not
  crashing with the fixed version

  [Regression Potential]

   * Too eager filtering could let packages not updated/not removed, but the next run of update-manager would retry updating/removing them.
   * Obtaining a fresh cache takes a ~100 milliseconds and the GUI may freeze for that time. For this short time u-m could show itself busy but IMO it would be more disturbing than the potentially not noticeable freeze.

  [Original bug text]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding update-manager.  This problem was most recently seen with package version 1:18.04.11.4, the problem page at https://errors.ubuntu.com/problem/c4f194c0df19fca32a25eff8c633ad69fe9b5abb contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1791931/+subscriptions