[Bug 772531] Re: 'ubuntu-minimal' cannot be found anymore while upgrading to Natty Narwhal

[RedSingularity]

As stated in comment #17, this is caused by an overload of the servers, not a bug in the operating system.  Jean filed bug 775525 addressing this wording the update manager uses. 
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https://bugs.launchpad.net/bugs/772531

Title:
  'ubuntu-minimal' cannot be found anymore while upgrading to Natty
  Narwhal

Status in “update-manager” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: update-manager

  Error message reads :

  Invalid package information

  After your package information was updated, the essential package
  'ubuntu-minimal' can not be found anymore.  This indicates a serious
  error, please report this bug against the 'update-manager' package and
  include the files in /var/log/dist-upgrade/ in the bug report.