[Bug 1792122] Re: /usr/bin/update-manager:apt_pkg.CacheMismatchError:foreach_cb:<listcomp>:packages_are_selected:is_selected:marked_delete

[Balint Reczey]

** Description changed:

+ [Impact]
+ 
+  * Update-manager crashes when it tries to remove a package not existing in the archive that was already removed since update-manager refreshed its cache.
+  * The fix TODO
+ 
+ [Test Case ]
+ 
+  (with Bionic's package names)
+  * Install older kernel packages, downgrade a few packages and mark the kernels autoremovable:
+    $ wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-hwe/linux-headers-4.8.0-36_4.8.0-36.36~16.04.1_all.deb
+    $ sudo dpkg -i linux-headers-4.8.0-36_4.8.0-36.36~16.04.1_all.deb && sudo apt-mark auto linux-headers-4.8.0-36 && sudo /etc/kernel/postinst.d/apt-auto-removal
+    $ sudo eatmydata apt install -y --allow-downgrades libpoppler73=0.62.0-2ubuntu2 poppler-utils=0.62.0-2ubuntu2
+ 
+  * Start update-manager in a different terminal and _don't_ start the
+ upgrade
+ 
+  * Remove kernel packages behind u-m's back:
+    $ sudo apt purge -y linux-headers-4.8.0-36
+ 
+  * Click Settings.. on update-manager's GUI, then Close on the appearing
+ dialogue. In buggy versions a crash with apt_pkg.CacheMismatchError is
+ shown in the terminal, in
+ 
+ [Regression Potential]
+ 
+  * TODO
+ 
+ [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 1:18.10.7, the problem page at https://errors.ubuntu.com/problem/e5025f8bd160fe34610030a2f4386a39418f0271 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/.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1792122

Title:
  /usr/bin/update-
  manager:apt_pkg.CacheMismatchError:foreach_cb:<listcomp>:packages_are_selected:is_selected:marked_delete

Status in update-manager package in Ubuntu:
  In Progress

Bug description:
  [Impact]

   * Update-manager crashes when it tries to remove a package not existing in the archive that was already removed since update-manager refreshed its cache.
   * The fix TODO

  [Test Case ]

   (with Bionic's package names)
   * Install older kernel packages, downgrade a few packages and mark the kernels autoremovable:
     $ wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-hwe/linux-headers-4.8.0-36_4.8.0-36.36~16.04.1_all.deb
     $ sudo dpkg -i linux-headers-4.8.0-36_4.8.0-36.36~16.04.1_all.deb && sudo apt-mark auto linux-headers-4.8.0-36 && sudo /etc/kernel/postinst.d/apt-auto-removal
     $ sudo eatmydata apt install -y --allow-downgrades libpoppler73=0.62.0-2ubuntu2 poppler-utils=0.62.0-2ubuntu2

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

   * Remove kernel packages behind u-m's back:
     $ sudo apt purge -y linux-headers-4.8.0-36

   * Click Settings.. on update-manager's GUI, then Close on the
  appearing dialogue. In buggy versions a crash with
  apt_pkg.CacheMismatchError is shown in the terminal, in

  [Regression Potential]

   * TODO

  [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 1:18.10.7, the problem page at https://errors.ubuntu.com/problem/e5025f8bd160fe34610030a2f4386a39418f0271 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/1792122/+subscriptions