[Bug 1785093] Please test proposed package

[Łukasz Zemczak]

Hello errors.ubuntu.com, or anyone else affected,

Accepted unattended-upgrades into xenial-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/unattended-upgrades/1.1ubuntu1.18.04.7~16.04.1 in a few hours, and then
in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/1785093

Title:
  RecursionError error in call_adjusted()

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  Fix Committed
Status in unattended-upgrades source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * Unattended-upgrades may crash and stop installing security updates on users' system due to entering infinite loop.
   * The fix ensures terminating the recursive calls.

  [Test Case]

   * TODO / observe the crash not being reported for fixed releases on
  errors.ubuntu.com.

  [Regression Potential]

   * Unattended-upgrades now adjusts package candidates only to lower versions than the one originally offered by apt's resolver. This is a change in behavior which aligns well with the default configuration, i.e. installing packages from -security but not from -updates, since -updates almost always have higher version numbers. This change may cause using different upgrade paths when PPAs are involved and all packages can't be upgraded to the highest versions found in allowed origins, because of Conflicts: for example.
   * Unexpected regressions can cause candidate adjustments not taking place, but please note that autopkgtest now includes applying all outstanding security updates for the release thus the new code is covered, too.

  [Original Bug report]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.1ubuntu1.18.04.5, the problem page at https://errors.ubuntu.com/problem/fa706afe2f0e04b661fe54da0a59b9fc3da50734 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/.

  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1991, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1647, in main
      cache, options, allowed_origins, blacklisted_pkgs, whitelisted_pkgs)
    File "/usr/bin/unattended-upgrade", line 1349, in calculate_upgradable_pkgs
      whitelisted_pkgs)
    File "/usr/bin/unattended-upgrade", line 1288, in try_to_upgrade
      cache.mark_upgrade_adjusted(pkg, from_user=not pkg.is_auto_installed)
    File "/usr/bin/unattended-upgrade", line 212, in mark_upgrade_adjusted
      self.call_adjusted(apt.package.Package.mark_upgrade, pkg, **kwargs)
    File "/usr/bin/unattended-upgrade", line 206, in call_adjusted
      self.call_adjusted(function, pkg, **kwargs)
    File "/usr/bin/unattended-upgrade", line 206, in call_adjusted

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