[Bug 1573097] [NEW] upgrade to 16.04 failed, hash sum mismatch

[Nick Name]

Public bug reported:

Tried to upgrade from 14.04.4 LTS to 16.04. (Date: 21.04.2016)

upgrading via 'do-release-upgrade -d' failed and ended with the
following message:

(Im using a german version)
"W:Fehlschlag beim Holen von 
http://de.archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources 
Hash-Summe stimmt nicht überein 
, E:Einige Indexdateien konnten nicht heruntergeladen werden. Sie 
wurden ignoriert oder alte an ihrer Stelle benutzt. "

(translation (kinda :) ))

"W:Failed to fetch
http://de.archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources 
hash sum mismatch,
E: Some index files failed to download. They have been ignored, or old ones used instead."

This error was also discovered with the dash-upgrader

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1573097

Title:
  upgrade to 16.04 failed, hash sum mismatch

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

Bug description:
  Tried to upgrade from 14.04.4 LTS to 16.04. (Date: 21.04.2016)

  upgrading via 'do-release-upgrade -d' failed and ended with the
  following message:

  (Im using a german version)
  "W:Fehlschlag beim Holen von 
  http://de.archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources 
  Hash-Summe stimmt nicht überein 
  , E:Einige Indexdateien konnten nicht heruntergeladen werden. Sie 
  wurden ignoriert oder alte an ihrer Stelle benutzt. "

  (translation (kinda :) ))

  "W:Failed to fetch
  http://de.archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources 
  hash sum mismatch,
  E: Some index files failed to download. They have been ignored, or old ones used instead."

  This error was also discovered with the dash-upgrader

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