Take Screenshots on Lubuntu

I've noticed that a plain vanilla install of Lubuntu (maybe only the PPC version?) doesn't include any program to take screenshots.
So, this is what I added as an alias to my ~/.bashrc file:

sleep 10 && lxsession-default screenshot

It waits 10 seconds, to give you time to minimize the Terminal window, and then takes a full desktop sceenshot, it saves the file as a PNG file