Comment 2 for bug 1397401

hi,

you want install Ubuntu 14.04 LTS ?
Upgrading from Ubuntu 12.04 LTS or Ubuntu 13.10 on a desktop system:
    Press Alt+F2 and type in "update-manager" (without the quotes) into the command box.
    Update Manager should open up and tell you: New distribution release '14.04 LTS' is available.
    Click Upgrade and follow the on-screen instructions.

Offline upgrade options via alternate CDs are no longer offered for Ubuntu Desktop and Ubuntu Server. Please ensure you have network connectivity to one of the official mirrors or to a locally accessible mirror and follow the instructions above.

If you want retry : in terminal

sudo dpkg-reconfigure -phigh -a