It has been renamed to kde-spectacle so you install it like so:
sudo apt install kde-spectacle
You'll find it in your start menu listed as "Take Screenshot"........
By default printscreen or alt print screen will get the whole desktop or the application in focus, respectively. But what if you want to select a portion of the screen?
gnome-screenshot:
ksnapshot
compiz
This is a nicely integrated solution
sudo apt-get install compizconfig-s........