[Bug 1826213] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for update-manager has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1826213

Title:
  /usr/bin/update-manager:AttributeError:/usr/bin/update-
  manager at 118:start_update:start_available:refresh_cache:update

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

Bug description:
  [Impact]
  update-manager is crashing frequently causing a bad user experience.

  [Test Case]
  The crash happens when an AssertionError is raised in MyCache but I haven't figure out how to recreate that. So here's a way to force an assertion error.

  1) edit the MyCache class's __init__ function (found in UpdateManager/Core/MyCache.py) to 'raise AssertionError' which will simulate having a dirty journal or broken packages
  2) run update-manager and observe the Traceback in comment #1

  With the version of update-manager from -proposed you'll no longer
  receive a Traceback you'll instead see a "Not all updates can be
  installed" dialog. Additionally, after clicking continue in that
  dialog you'll be presented with another dialog that says "Software
  index is broken".

  We can also use the bucket in the Error Tracker to confirm that there
  are no crashes with the version of the package from -proposed.

  [Regression Potential]

  Original Description
  --------------------
  The Ubuntu Error Tracker has been receiving reports about a problem regarding update-manager.  This problem was most recently seen with package version 1:19.04.5, the problem page at https://errors.ubuntu.com/problem/1bcfccc6ceab83c6e401f14c655c1cd5045be5d4 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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