*. Web album management - You can easily view and upload images to online image uploading sites.
*. Edit, Zoom ... change brightness, Crop pictures, etc (Picasa seems to give slightly better zoomed pictures as well).
*. Organize pictures in your HDD.
*. Easily create video picture albums.
*. Tag photos with places.
*. Printing support.
*. Enhance pictures.
*. Share your photos with friends over the web with ease...
So to install Picasa in Ubuntu, open your terminal and issue the below commands.
Now follow with this command.
sudo dpkg -i picasa_3.0-current_i386.deb
Once the installing is complete, you should be able to run it via "Applications" -> "Graphics" -> "Picasa".