do-release-upgrade -d to Trusty

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
http://extras.ubuntu.com/ubuntu/dists/trusty/main/source/Sources 404
Not Found
, W:Failed to fetch
http://extras.ubuntu.com/ubuntu/dists/trusty/main/binary-i386/Packages
404 Not Found
, E:Some index files failed to download. They have been ignored, or
old ones used instead.


Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
=== Command detached from window (Tue Nov 19 21:26:12 2013) ===
=== Command terminated with exit status 1 (Tue Nov 19 21:26:12 2013) ===