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

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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.

** Affects: update-manager-core (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
do-release-upgrade for 12.04 to 14.04 fails 
https://bugs.launchpad.net/bugs/1392869
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