Install Chef Solo Ubuntu 12.04. from http://generalthings.com/2012/05/08/simple-steps-install-chef-ubuntu-12-04-10-04/

install_chef.sh

echo "deb http://apt.opscode.com/ precise-0.10 main" | sudo tee /etc/apt/sources.list.d/opscode.list 
sudo mkdir -p /etc/apt/trusted.gpg.d
gpg --keyserver keys.gnupg.net --recv-keys 83EF826A 
gpg --export [email protected] | sudo tee /etc/apt/trusted.gpg.d/opscode-keyring.gpg > /dev/null
sudo apt-get -y update 
sudo apt-get -y install opscode-keyring
sudo apt-get -y upgrade
sudo apt-get -y install chef