[Bug 1310089] Re: 'ubuntu-minimal' could not be located

[Robin Sheat]

This just happened to me (again - there's another bug about it
somewhere), it was because I was using an unofficial mirror that got
removed as a third-party source, and then there was no source to pull
regular Ubuntu software from left.

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https://bugs.launchpad.net/bugs/1310089

Title:
  'ubuntu-minimal' could not be located

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  I was upgrading from 12.04 to 14.04 using the update manager. After
  the Distributing upgrade was ing the second step an error came up:
  'Invalid package information.  After updating your package
  information, the essential package 'ubuntu-minimal' could not be
  located. This may be because you have no official mirrors listed in
  your software sources, or because of excessive load on the mirror you
  are using. see /etc/apt/source.list for the current list of configured
  software sources....'

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.11
  ProcVersionSignature: Ubuntu 3.2.0-43.68-generic-pae 3.2.42
  Uname: Linux 3.2.0-43-generic-pae i686
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: i386
  Date: Sat Apr 19 21:28:22 2014
  GsettingsChanges: com.ubuntu.update-manager launch-time 1397938874
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-04-19 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2014-04-19 21:26:12.695832
   Log time: 2014-04-19 21:26:33.693655
   Log time: 2014-04-19 21:27:15.451259
   Log time: 2014-04-19 21:28:35.605190
  VarLogDistupgradeTermlog:

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