installation - Geting and installing latest version of QGIS in Ubuntu?

I'd like to get the latest 64-bit dev build of QGIS on my Ubuntu setup.

How exactly do I go about it?

I assume it's some kind of arcane terminal command.

Answer

you need to add the ppa of ubuntugis first.

From commandline:

sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable 
sudo apt-get update

the add the following line to the file /etc/apt/sources.list (you can also use the sofware center for that)

deb     http://qgis.org/debian-nightly precise main

then install qgis

sudo apt-get update
sudo apt-get install qgis