Howto Install Picasa 3.5 in ubuntu

add the Google testing repository to /etc/apt/sources.list file

sudo gedit /etc/apt/sources.list

Add the following line

deb http://dl.google.com/linux/deb/ testing non-free

Save and exit

Update the source list using the following command

sudo apt-get update

Install picasa using the following command

sudo apt-get install picasa