Public bug reported:

To Reproduce:
1. Click on the title bar of any open window so that it is on top.
2. Press PrScrn while holding the left Alt key.

Expected:
The 'Save Screenshot' dialog pops up.

Actually:
When left Alt key is pressed, HUD always pops up and makes it impossible to 
take that screenshot.

The default keyboard shortcut to HUD is set as 'Alt L', and 'Take screenshot of 
a window' as 'Alt + Print'.
And HUD doesn't wait for a key-releasing before it pops, which basically 
disables every combination with the left Alt key.
After disabling the shortcut to HUD, screenshot taking works fine.

$ lsb_release -rd
Description:    Ubuntu 14.04 LTS
Release:        14.04
$ apt-cache policy gnome-control-center
gnome-control-center:
  Installed: 1:3.6.3-0ubuntu56
  Candidate: 1:3.6.3-0ubuntu56
  Version table:
 *** 1:3.6.3-0ubuntu56 0
        500 http://mirrors.aliyun.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

This problem has been there for a long time. I noticed it since 12.10,
if I remember correctly.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-control-center 1:3.6.3-0ubuntu56
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Tue May 13 12:42:06 2014
InstallationDate: Installed on 2012-08-12 (639 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to trusty on 2014-04-25 (17 days ago)
usr_lib_gnome-control-center:
 activity-log-manager 0.9.7-0ubuntu14
 deja-dup             30.0-0ubuntu4

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1318898

Title:
  Keyboard Shortcut to HUD (Left Alt) Conflicts with that to Taking
  Screenshot to Current Window (Alt + PrScrn)

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