[Bug 1310671] [NEW] upgrade 13.10 -> 14.04 keeps failing, "failed to fetch"

[N7DR]

Public bug reported:

I have tried to upgrade my laptop from 13,10 to 14.04 multiple times,
but I always get the same error:

----

W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_trusty_universe_binary-i386_Packages  Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.

----

The rubric says "This is usually some sort of network problem", but
connectivity to the Internet is fine, and there is no indication at all
of any kind of network issue.

Since you ask for this:

[L:~] lsb_release -rd
Description:    Ubuntu 13.10
Release:        13.10

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

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https://bugs.launchpad.net/bugs/1310671

Title:
  upgrade 13.10 -> 14.04 keeps failing, "failed to fetch"

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

Bug description:
  I have tried to upgrade my laptop from 13,10 to 14.04 multiple times,
  but I always get the same error:

  ----

  W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_trusty_universe_binary-i386_Packages  Hash Sum mismatch
  , E:Some index files failed to download. They have been ignored, or old ones used instead.

  ----

  The rubric says "This is usually some sort of network problem", but
  connectivity to the Internet is fine, and there is no indication at
  all of any kind of network issue.

  Since you ask for this:

  [L:~] lsb_release -rd
  Description:    Ubuntu 13.10
  Release:        13.10

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