[Bug 571734] Re: crashes if a package fails to get marked for upgrade

[Ubuntu QA's Bug Bot]

** Tags added: testcase

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https://bugs.launchpad.net/bugs/571734

Title:
  crashes if a package fails to get marked for upgrade

Status in “unattended-upgrades” package in Ubuntu:
  Fix Released
Status in “unattended-upgrades” source package in Lucid:
  Fix Released

Bug description:
  Binary package hint: unattended-upgrades

  When a package is marked for upgrade but can not be upgraded (a rare
  situation) it fails with the following error:

  ...
  package 'libcompizconfig0-dev' upgradable but fails to be marked for upgrade (E:Unable to correct problems, you have held broken packages.)
  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 490, in <module>
      main()
    File "/usr/bin/unattended-upgrade", line 306, in main
      rewind_cache(cache, pkgs_to_ugprade)
  NameError: global name 'pkgs_to_ugprade' is not defined
  ...

  This is trivial to fix.

  TEST CASE:
  - regression test is enough, the fix is a one line change

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