Can't take screenshot with 14.04
Solution 1:
Dependent on the desktop you use (I don't know, if you use Unity-Desktop or Gnome-Shell or even KDE),there is a different way, how to find the app "screenshot". It is installed by default.
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In Gnome-Shell: go to your menu and there go to accessories. There you will find "screenshot".
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In Unity: go to the unity-lens and look for all your installed apps. There you should find "Screenshot".
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In Cinnamon: go to your menu and there to "accessories" and there to "screenshot"
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In KDE: to to your KDE-menu and there to "accessories" and there look for "screenshot".
This app is really easy to handle and lets you save your screenshot in your selected folder. So no problem of taking screenshots in Ubuntu or even LinuxMint.
Solution 2:
As I understood from here it is problem with HP laptops, and prt sc button will work normally when you connect a usb keyboard.
As temporary solution till the bug is fixed we can change shortcut for screenshot to some unassigned key combinations.
Goto System Settings > Keyboard change Print to F12 etc.