[Bug 1392869] Re: do-release-upgrade for 12.04 to 14.04 fails

[Mark]

** Package changed: ubuntu => update-manager-core (Ubuntu)

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https://bugs.launchpad.net/bugs/1392869

Title:
  do-release-upgrade for 12.04 to 14.04 fails

Status in “update-manager-core” package in Ubuntu:
  New

Bug description:
  I recently successfully upgraded an Lubuntu 11.10 x86-64 installation
  to 12.04.

  $ lsb_release -rd
  Description:	Ubuntu 12.04.5 LTS
  Release:	12.04

  Now I want to update from 12.04 to 14.04. However on running do-
  release-upgrade I consistently see the same error. It seems to be a
  network-related problem, but I have tried several times over the last
  few weeks with the same result each time. There are also some messages
  about being unable to rename files.

  I have attached the full console output on running do-release-upgrade.

  Some lines from that which may be relevant:

  Error during update

  A problem occurred during the update. This is usually some sort of 
  network problem, please check your network connection and retry. 

  W:Failed to fetch 
  copy:/var/lib/apt/lists/partial/archive.canonical.com_ubuntu_dists_trusty_partner_i18n_Translation-en 
  rename failed, No such file or directory 
  (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_trusty_partner_i18n_Translation-en.gz.gz 
  -> 
  /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_trusty_partner_i18n_Translation-en.gz). 
  [... many similar lines...]
  , E:Some index files failed to download. They have been ignored, or 
  old ones used instead.

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