sudo add-apt-repository ppa:ubuntu-toolchain-r/test
wget -O - http://dl.hhvm.com/conf/hhvm.gpg.key | sudo apt-key add -
echo deb http://dl.hhvm.com/ubuntu lucid main | sudo tee /etc/apt/sources.list.d/hhvm.list
sudo apt-get update
sudo apt-get install gcc-4.8 g++-4.8 gcc-4.8-base
sudo apt-get install hhvm