Add to /etc/apt/sources.list:

deb http://emacs.naquadah.org/ stable/
deb-src http://emacs.naquadah.org/ stable/

Execute:

,# wget -q -O - http://emacs.naquadah.org/key.gpg | sudo apt-key add -
,# apt-get update
,# apt-get install emacs-snapshot
,# update-alternatives --set emacs /usr/bin/emacs-snapshot

This post the first thing I’ve done in Emacs 24!