[Bug 838787] Re: Archive mirrors not recognized as a valid mirror

[Eric Sorton]

When upgrading recently, I encountered this bug on multiple systems.  My
hosts have a sources.list file that points at a local server running
approx.  This approx server is not a valid mirror.  After running do-
release-upgrade, I received the missing 'ubuntu-minimal' message.  In my
case, update-manager commented out all lines in sources.list which
pointed to my approx server (since it was not a valid mirror).

I found two possible solutions others may try.

One, it is possible to have update-manager allow third party sources as
described in a comment at:

http://bethesignal.org/blog/2009/04/13/approx-package-caching-ubuntu-
debian-lovers/

Two, if your sources.list contains both valid and invalid mirrors,
update-manager will comment out the invalid mirrors, leaving the valid
mirrors.  If none of the remaining valid mirrors is the main repository,
you get the missing 'ubuntu-minimal' message.  If your sources.list ONLY
contains invalid mirrors, then update-manager will ask if you want to
continue with the invalid mirrors, rewrite your sources.list, and
continue with the upgrade.  So, if your main repository is an invalid
mirror, but you have other lines containing valid mirrors, try
commenting out the valid mirrors during the upgrade.

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https://bugs.launchpad.net/bugs/838787

Title:
  Archive mirrors not recognized as a valid mirror

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

Bug description:
  Some mirrors listed on https://launchpad.net/ubuntu/+archivemirrors
  are not recognized as valid mirrors, thus the dist-upgrade fails, when
  using them, and displays a message about essential packages can not be
  found (ubuntu-desktop or ubuntu-minimal)

  The mirrors reporting these issues:
  * Boston University Linux Users Group (www.lug.bu.edu)
  * University of Canterbury (ucmirror.canterbury.ac.nz)
  * Retrosnub Internet Services (ubuntu.retrosnub.co.uk)
  * ihug (mirror.ihug.co.nz)
  * University of Mannheim (mirror.informatik.uni-mannheim.de)
  * RM Education (mirror01.th.ifl.net)
  * FDCServers.net LLC (76.73.4.58)

  The message is:
  "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 using the command 'ubuntu-bug update-manager' in a terminal and include the files in /var/log/dist-upgrade/ in the bug report."

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: update-manager 1:0.150.3
  ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  Architecture: amd64
  Date: Thu Sep  1 08:48:24 2011

  GConfNonDefault:
   /apps/update-manager/check_new_release_ignore=
   /apps/update-manager/first_run=false
   /apps/update-manager/show_details=true
   /apps/update-manager/window_size=(600,600)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to natty on 2011-09-01 (0 days ago)

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