My post-install script for Ubuntu.

postinstall.sh

#!/bin/bash
# Add some PPAs
sudo add-apt-repository -y ppa:webupd8team/sublime-text-2 #sublime text
sudo add-apt-repository -y ppa:tualatrix/ppa  #ubuntu tweak
sudo add-apt-repository ppa:hertzog/nautilus-dropbox #nautilus-dropbox
sudo apt-get update

# upgrade dist
sudo apt-get upgrade

# install some libs

sudo apt-get -q -y install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion pkg-config python-gpgme

# install some apps
sudo apt-get -q -y install git gitg chromium-browser guake gpick vlc sublime-text ubuntu-tweak vim kazam octave nautilus-dropbox

# install heroku toolbelt
wget -qO- https://toolbelt.heroku.com/install-ubuntu.sh | sh

cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86" | tar xzf -

# install rvm
\curl -L https://get.rvm.io | bash -s stable --ruby

# enter a new bash level
bash

rvm remove 1.9.3
rvm install 1.9.3 --with-readline
rvm @global do gem install pry awesome_print

#go back
exit