Unity is the default desktop environment for Ubuntu. But sometimes it is a little heavy for some users like me.
Thierry has recommended LXDE, a lightweight/free desktop environment for Unix-like platform.
With LXDE, the system runs more fluent than before.
To install LXDE, you have just type, and relogin :
sudo apt-get install lxde
To visit the site, click here : Wowebooks
A very good site to download the ebooks, often published by O’reilly or Apress.
Click the Download now>> in the right bottom of each book, you can find the link to download the book
Wait just few seconds, you can read your books~~