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First you need to edit /etc/apt/sources.list file
sudo vi /etc/apt/sources.list
add the following line
# Google software repository
deb http://dl.google.com/linux/deb/ stable non-free
Save and exit the file
you must download the key and then use apt to install it and refresh your package indexes.
Run these commands as root:
wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
Now you need to update the source list using the following command
sudo apt-get update
Install google applications now you can see the following command to install google picasa
sudo apt-get install picasa



