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

By Marius Nestor on February 10th, 2011 11:30 GMT

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
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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
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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
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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...
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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...
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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.

If you have problems with the tutorial, do not hesitate to comment below!
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