[Bug 1825886] Re: Unattended-upgrades may crash when a package does not have a candidate

[Balint Reczey]

** Summary changed:

- /usr/bin/unattended-upgrade:AttributeError:/usr/bin/unattended-upgrade at 2268:main:run:calculate_upgradable_pkgs:try_to_upgrade:mark_upgrade_adjusted:call_adjusted:transitive_dependencies:transitive_dependencies
+ Unattended-upgrades may crash when a package does not have a candidate

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https://bugs.launchpad.net/bugs/1825886

Title:
  Unattended-upgrades may crash when a package does not have a candidate

Status in unattended-upgrades package in Ubuntu:
  In Progress
Status in unattended-upgrades source package in Bionic:
  New
Status in unattended-upgrades source package in Cosmic:
  New
Status in unattended-upgrades source package in Disco:
  New

Bug description:
  [Impact]

   * Unattended-upgrades may crash when a package in apt's cache does not have a candidate and it is visited when finding packages to adjust.
   * The crash occurs when apt.Package.candidate is None and the fix is checking if .candidate is truthy and it that case is safe to reference the .dependencies attribute.

  [Test Case]

   * Watch the error not happening anymore.

  [Regression Potential]

   * The fix is very small and is not likely to cause any regression.

  [Original Bug Text]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.10ubuntu5, the problem page at https://errors.ubuntu.com/problem/0d08f995622277f81d276f1eae7e1a722e3627de 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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