I found solution that works just fine. 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.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screenshot in Ubuntu.
https://bugs.launchpad.net/bugs/1295994

Title:
  Unable to use Printscreen Button on Ubuntu 14.04 in GNOME Shell

Status in gnome-screenshot package in Ubuntu:
  Confirmed

Bug description:
  Hi, I am trying Ubuntu 14.04 and I noticed that Printscreen button
  doesn't work. I had no problems in 13.10. If I run "gnome-screenshot",
  or "gnome-screenshot -a"  in a Terminal it says "Unable to use GNOME
  Shell's builtin screenshot interface, resorting to fallback X11.    I
  noticed that the function works if custom shortcuts are set. Can
  anyone help? Thanks

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