[Bug 1790670] Re: /usr/bin/update-manager:aptdaemon.errors.AptDaemonError(org.debian.apt):_convert_dbus_exception:cancel:__call__:call_blocking:_on_clicked:_deferable:_convert_dbus_exception

[Balint Reczey]

Tested with 1:18.04.11.6, the fix works as expected.


** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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https://bugs.launchpad.net/bugs/1790670

Title:
  /usr/bin/update-
  manager:aptdaemon.errors.AptDaemonError(org.debian.apt):_convert_dbus_exception:cancel:__call__:call_blocking:_on_clicked:_deferable:_convert_dbus_exception

Status in update-manager package in Ubuntu:
  Fix Released
Status in update-manager source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

  Closing the GUI of update-manager tries to cancel the running
  transaction then raises an Exception since cancellation fails.

  Users experience crashes after closing the GUI and many of them send
  error reports about the issue while nothing can be done about those
  transactions.

  The fix tries to close the transaction when it seems to be possible to
  cancel it and ignores the exception when cancellation fails.

  
  [Test Case]

  1. Set up a fully updated system then downgrade a few packages and install autoremovable ones to create work for u-m:
  $ sudo eatmydata apt install -y --allow-downgrades linux-headers-4.15.0-32 linux-headers-4.15.0-32-generic gnome-software=3.28.1-0ubuntu4 gnome-software-common=3.28.1-0ubuntu4 ; 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

  2. Start update-manager from the terminal and press "Install Now".

  3. While the transaction is running close u-m's GUI with the (X).
  The fixed u-m GUI just closes, while the not fixed ones show exceptions. With the fix the GUI closes, but the transaction is run to completion in the background.

  [Regression Potential]

  There is not a lot of room for regressions. As usual update-manager may fail to start due to syntax errors, but ignoring the exception can hardly cause any trouble.
  Users may find it surprising that the transaction proceeds in the background, but this is still better than trowing the exception like before.

  [Other Info]
   
   * Anything else you think is useful to include
   * Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
   * and address these questions in advance

  The Ubuntu Error Tracker has been receiving reports about a problem regarding update-manager.  This problem was most recently seen with package version 1:18.10.4, the problem page at https://errors.ubuntu.com/problem/6d00ba06c8a67ead2e2021397da6006d84ddde5e 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/.

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