For Microsoft is replacing MSN messenger to Skype, it’s time to consider use Skype in Ubuntu, here is the instructions how to install Skype in Ubuntu(from here):

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sudo apt-add-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"
sudo apt-get update && sudo apt-get install skype

Note:

1. the “lsb_release -sc” command returns your Ubuntu code name, such as “lucid”, “precise”.

2. The original article only mentioned Ubuntu 12.04, however it works for Ubuntu 10.04 as well.

3. The Skype package size is about 29MB.