How to Install Firefox 4 in Ubuntu 10.10, 10.04 and 9.10

The following tutorial will teach every Ubuntu 10.10, Ubuntu 10.04 LTS and Ubuntu 9.10 user how to install the current development version of the upcoming Mozilla Firefox 4 web browser.

At the request of many of our readers, we've created this tutorial to guide them with the installation of the popular Mozilla Firefox 4 web browser. However, be aware that this version is still in development and it may crash often!

The Mozilla Firefox 4 packages are available for the following Ubuntu distributions:

· Ubuntu 10.10 (Maverick Meerkat);
· Ubuntu 10.04 LTS (Lucid Lynx);
· Ubuntu 9.10 (Karmic Koala).

To install Mozilla Firefox 4 on your system follow the next step-by-step (with screenshots) tutorial.

Step 1 - Add the Firefox 4 repository

No matter what operating system you are running (Ubuntu 10.10, Ubuntu 10.04 LTS or Ubuntu 9.10), hit the ALT+F2 key combination on your keyboard, check the "Run in terminal" option and paste the following command in the "Run Application" dialog:


gksu add-apt-repository ppa:ubuntu-mozilla-daily/ppa

Enter your password when asked and hit the OK button. A terminal window will appear for a few seconds, and it will automatically close. Hit the ALT+F2 key combination again, check the "Run in terminal" option and paste the following command in the "Run Application" dialog:

gksu apt-get update

Enter your password when asked and hit the OK button. A terminal window will appear for a few seconds, and it will automatically close.

Step 2 - Install Firefox 4

Hit the ALT+F2 key combination on your keyboard, check the "Run in terminal" option and paste the following command in the "Run Application" dialog:

sudo apt-get install firefox-4.0

A terminal window will appear. Enter your password when asked.

When you will be asked if you want to install the Firefox 4 packages, type Y and hit Enter. Wait for the installation to finish...
 
That's it! Firefox 4 is now completely installed in your Ubuntu machine. You can start it from Applications -> Internet -> Minefield 4.0 Web Browser...
 
In time, Mozilla Firefox 4 will automatically update to newer versions, so make sure you update your system regularly. Mozilla Firefox 4 will also be the default web browser in the upcoming Ubuntu 11.04 (Natty Narwhal) operating system. 

source : news.softpedia.com