[Bug 1826213] Re: /usr/bin/update-manager:AttributeError:/usr/bin/update-manager at 118:start_update:start_available:refresh_cache:update

[Launchpad Bug Tracker]

** Branch linked: lp:~ubuntu-core-dev/ubuntu/focal/update-manager/ubuntu

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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:
  Confirmed
Status in update-manager source package in Eoan:
  Confirmed
Status in update-manager source package in Focal:
  In Progress

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

  Additionally, we can 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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