Type these stuff in terminal

$sudo add-apt-repository ppa:ubuntuhandbook1/corebird
$sudo apt-get update
$sudo apt-get install corebird

Ubuntu 14.04 user also need Gnome3 and Gnome 3 Staging PPA for the dependencies:

$ sudo add-apt-repository ppa:gnome3-team/gnome3
$ sudo add-apt-repository ppa:gnome3-team/gnome3-staging

Enjoy tweeting!