How do I install Handbrake?

Here is how to install the official releases, not the snapshots

sudo add-apt-repository  ppa:stebbins/handbrake-releases
sudo apt-get update
sudo apt-get install handbrake-cli

You can then run it with:

HandBrakeCLI --help

http://packages.ubuntu.com/search?searchon=names&keywords=libnotify
Get it from here. You need libnotify1 v0.5 or newer.

Installation (original instructions available here)

First thing that you have to do is to add the official PPA - there are instructions on how to add a PPA here on Ask Ubuntu. The PPA you want to add is:

Open a terminal (Ctrl+Alt+T) and run:

sudo add-apt-repository ppa:stebbins/handbrake-snapshots
sudo apt-get update

And finally the installation:

sudo apt-get install handbrake-gtk handbrake-cli