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
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https://bugs.launchpad.net/bugs/1397401
Title:
Ubuntu upgrade fails
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