[Bug 1550922] Re: dist-upgrade from Ubuntu Mate 14.04.4 LTS to 16.04 LTS (Beta1) fails

[Winfried PLappert]

I have managed to bypass this problem by manipulation the Python code of
the upgrade process. But it is far easier to bypass it properly by
setting up a config file in /etc/update-manager/release-
upgrades.d/*.cfg.

According to http://askubuntu.com/questions/425355/error-authenticating-
some-packages-while-upgrade one needs to create a file /etc/update-
manager/release-upgrades.d/unauth.cfg with the contents:

[Distro]
AllowUnauthenticated=yes

The upgrade runs smoothly through.

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https://bugs.launchpad.net/bugs/1550922

Title:
  dist-upgrade from Ubuntu Mate 14.04.4 LTS to 16.04 LTS (Beta1) fails

Status in ubuntu-release-upgrader package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  1.) I installed a fresh copy of ubuntu-mate-14.04-2-LTS-desktop-amd64.iso in a virtual machine.
  2.) sudo apt-get update && sudo aptget dist-upgrade
  3.) disabled /etc/apt/sources.list.d/extra-ppas.list by just commenting out all the deb lines.
  4.) sudo do-release-upgrade -d
  5.) Output -- shortened:
  authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg' ^M
  extracting 'xenial.tar.gz'^M
  ^M
  Reading cache^M
  ^M
  Checking package manager^M
  ...
  99% [http://ie.archive.ubuntu.com trusty/universe i386 Packages 31.7 MB]
  ...
  Calculating the changes
  Error authenticating some packages 
  ^M
  It was not possible to authenticate some packages. This may be a 
  transient network problem. You may want to try again later. See below 
  for a list of unauthenticated packages. 

  module-init-tools 
  Restoring original system state
  Aborting

  6.) module-init-tools is supposed to be a transitional packages, and
  should be removed after installlation. While attempting to do this,
  module-init-tools whould remove have of ubuntu mate. So I did not do
  it, but decided to file a bug instead.

  7.) lsb_release -rd
  Description:	Ubuntu 14.04.4 LTS
  Release:	14.04

  8.) package in question:
  ubuntu-release-upgrader-core: /usr/bin/do-release-upgrade, version 1:0.220.8

  9.) More information when needed; I don't know what you want from me
  :(

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