Prebuilt Packages on Ubuntu 12.04

To install prebuilt packages for Ubuntu 12.04 (amd64), add the hhvm repository to your /etc/apt/sources.list

deb http://dl.hhvm.com/ubuntu precise main

Also enable the universe component:

deb http://archive.ubuntu.com/ubuntu precise main universe

Then update your package index:

$ sudo apt-get update

Finally, you can install (or update) your package with the normal apt-get install process:

$ sudo apt-get install hhvm