1.) I have reset my virtual machine to a state after 14.04 kernel update.
2.) I have created the file /etc/update-manager/release-upgrades.d/unauth.cfg 
as described above.
3.) I started do-release-upgrade and it does NOT fail any more with the message 
of unauthenticated packages.

4.) This can be considered a circumvention (for the time being).
5.) After the upgrade to 16.04 you can safely remove package module-init-tools, 
since the dependencies have been changed (in the other packages) to 
"module-init-tool | kmod". "|" is OR, which can be satisfied by kmod in 16.04.

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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

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