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

[Brian May]

No!

Like I said in comment #19, this is a generic error, and may have a
number of causes.

In my case it was not overloaded servers that caused the problem. The
problem was that the upgrade process commented out all my sources.list
entries so the upgrade could not continue.

Brian May

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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.