Question
Ubuntu 12.04 to 14.04 Upgrade
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×do-release-upgrade
won't show anything until Ubuntu 14.04.1 is released, which is scheduled for July 24th.
deb http://archive.ubuntu.com/ubuntu precise main
deb http://archive.ubuntu.com/ubuntu precise-updates main
deb http://security.ubuntu.com/ubuntu precise-security main universe
deb http://archive.ubuntu.com/ubuntu precise universe
deb http://archive.ubuntu.com/ubuntu precise-updates universe
Considering we’re not running the desktop version of Ubuntu, I am not sure why you felt the need to post this here.
-p
flag actually just uses the upgrading logic from the proposed repository which contains unreleased versions of the upgrader package for testing purposes. From the man page:
-p, --proposed Try upgrading to the latest release using the upgrader from $distro-proposed