Edit /etc/apt/sources.list file

gksudo gedit /etc/apt/sources.list

Add following lines to Sources list

for Ubuntu 9.10 (Karmic)

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

for Ubuntu 9.04 (Jaunty)

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

 save and close editor

Add the GPC key

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

Update sources list

 sudo apt-get update

Install Chrome Browser

sudo apt-get install chromium-browser