Ubuntu 12.04 "Precise Pangolin" comes with stunning GUI Unity 5.0 interface. But is you are using Ubuntu 11.10 and want to use Unity 5.0 interface and also don't upgrade to 12.04 unstable. Then there is a better way of doing it. You can install Unity 5.0 interface in your Ubuntu 11.10 "Oneiric Ocelot" and wait for stable Ubuntu 12.04 LTS in April.
Here is the method of how to install Unity 5.0 interface on your Ubuntu 11.10. You can install it using two various method. We will show it one by one.
First method is using terminal. So open terminal [ctrl + alt + T] and write the following command.
sudo add-apt-repository ppa:unity-team/staging
sudo apt-get update
sudo apt-get dist-upgrade
then restart your device to save and apply all the packages and Unity 5.0 will be installed on your Ubuntu 11.10.
Second method is somewhat tedious, in this you have to add Personal Package Archives [PPA] to your software source. For that open your USC [Ubuntu Software Center] goto edit tab and select Software Sources.
Then goto second tab Other Software and click on Add....
Now in new window type "ppa:unity-team/staging" and click on Add Source.
Next open your update manager and check for new updates.
Here all new updates of Unity 5.0 will be listed. Download them and restart your device. After restart you can see the Unity 5.0 will be install on your device.
Here is the video tutorial for the second methos how to install Unity 5.0 using PPA.