[Bug 1775292] Re: Unattended-upgrades stopped adjusting candidates in 1.1

[Balint Reczey]

1.1ubuntu1.18.04.7~16.04.2 passes, too:

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-xenial/xenial/amd64/u/unattended-
upgrades/20190228_150449_11313@/log.gz

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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https://bugs.launchpad.net/bugs/1775292

Title:
  Unattended-upgrades stopped adjusting candidates in 1.1

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 fail to install an update when the highest
  version of a package to be updated exists in an origin u-u is not
  allowed to pull packages from.

  [Test Case]

   * Run sudo apt update && sudo unattended-upgrade --dry-run --verbose --debug
   * Observe no line with "adjusting candidate version: " with buggy u-u version
   * Install fixed u-u version
   * Run sudo unattended-upgrade --dry-run --verbose --debug
   * Observe lines "adjusting candidate version: "

  [Regression Potential]

   * Unattended-upgrade may crash when adjusting candidates preventing
  upgrades to be installed

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