prntscrn button doesn't work in Ubuntu 16.04 (worked fine in 14.04)

Question

I'm running 16.04 on an HP laptop. In 14.04, the prntscrn button worked as intended (pressing it took a screenshot of the whole screen, pressing shift + prntscrn took a partial screenshot of a selected area, etc.). Ever since upgrading to 16.04, I can't get it to work at all.

All of the shortcuts are set correctly and everything.

gnome-screenshot is installed, and works if I type it into the terminal.

xev shows this for press + release of the prntscrn button:

KeyPress event, serial 37, synthetic NO, window 0x4400001,
    root 0x2c2, subw 0x0, time 5325568, (-443,285), root:(346,337),
    state 0x10, keycode 218 (keysym 0xff61, Print), same_screen YES,
    XKeysymToKeycode returns keycode: 107
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 37, synthetic NO, window 0x4400001,
    root 0x2c2, subw 0x0, time 5325759, (-443,285), root:(346,337),
    state 0x10, keycode 218 (keysym 0xff61, Print), same_screen YES,
    XKeysymToKeycode returns keycode: 107
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

For comparison, it shows this for the press + release of the F12 button (which works well):

KeyPress event, serial 37, synthetic NO, window 0x4600001,
    root 0x2c2, subw 0x0, time 5433196, (-509,256), root:(280,308),
    state 0x10, keycode 96 (keysym 0xffc9, F12), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 37, synthetic NO, window 0x4600001,
    root 0x2c2, subw 0x0, time 5433406, (-509,256), root:(280,308),
    state 0x10, keycode 96 (keysym 0xffc9, F12), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

Answer 1

I found a solution here:

As I noticed from xev output pressing prt sc on HP Pavilion returns two different codes: 218(the key's code itself) and XKeysymToKeycode returns 107.

I looked at key mapping with xmodmap -pke and noticed that there's binding 107 to Print action but there's no binding for 218 keycode. So I just add binding for keycode 218:

xmodmap -e "keycode 218 = Print"

and then removed binding from 107 keycode

xmodmap -e "keycode 107 = "

After that everything have started working just fine. Hope I helped someone.