edit the apt sources file

$ sudo gedit /etc/apt/sources.list

add in

deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main

then add in the apt key

sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com 0xfbef0d696de1c72ba5a835fe5a9bf3bb4e5e17b5

then update apt and install chrome

sudo apt-get update
sudo apt-get install chromium-browser