Install emacs24 on ubuntu

install_emacs.sh

#!/bin/sh

# adapted from https://launchpad.net/~cassou/+archive/emacs

sudo apt-get update
sudo apt-get install
sudo apt-get purge emacs-snapshot-common emacs-snapshot-bin-common emacs-snapshot emacs-snapshot-el emacs-snapshot-gtk emacs23 emacs23-bin-common emacs23-common emacs23-el emacs23-nox emacs23-lucid auctex emacs24 emacs24-bin-common emacs24-common emacs24-non-dfsg

#To add this PPA:
sudo add-apt-repository ppa:cassou/emacs
sudo apt-get update

#Then, for emacs-snapshot:
#sudo apt-get install emacs-snapshot-el emacs-snapshot-gtk emacs-snapshot

#*Or*, for emacs24:
sudo apt-get install emacs24 emacs24-el emacs24-common-non-dfsg