Lot of keyboard shortcuts do not works properly (including Ctrl+Alt+Fi)

What happens :

I'm running precise, and I've a lot of keyboard shortcuts that don't work properly. Some examples are Alt+F2, Ctrl+Alt+Fi Alt+f4 or F11 (for firefox FUllscreen). Nothing happen. These shortcuts works with easystroke (those I tried, like Alt+F4)

Some other works well (Super for displaying Unity or Gnome Shell "Dashes"). This appear in Unity, Gnome Shell, or even n the Unity greeter (no Ctrl+Alt+Fi)

What I expected :

Just the usals results of these shortcut (execute dialog for Alt+F2, changing virtual term for Ctrl+Alt+Fi closing the window for Alt+F4 .

PS : I'm really not sure about the chosen package for rapporting the bug. Is this one OK ?

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: keyboard-configuration 1.70ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-15.24-generic 3.2.5
Uname: Linux 3.2.0-15-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Mon Feb 13 21:44:02 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120201.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: console-setup
UpgradeStatus: Upgraded to precise on 2012-02-13 (0 days ago)