How to Install Chromium (Google chrome) in Ubuntu

First you need to download .deb package from here using the following command
$ wget http://media.codeweavers.com/pub/crossover/chromium/cxchromium_0.9.0-1_i386.deb

Now you have cxchromium_0.9.0-1_i386.deb package install this package using the following command
$ sudo dpkg -i cxchromium_0.9.0-1_i386.deb

Using Ubuntu PPA
First you need edit /etc/apt/sources.list file
sudo gedit /etc/apt/sources.list

Add the following two lines
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 exit the file

Now add the GPG key using the following command
$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xfbef0d696de1c72ba5a835fe5a9bf3bb4e5e17b5

Update source list
$ sudo apt-get update

Install chromium browser using the following command
$ sudo apt-get install chromium-browser

This will complete the installation.

If you want to open chromium go to Applications->CrossOver Chromium->Chromium web browser in action