Keyboard shortcuts randomly changes (seems to be qwerty/azerty related)

[da2]

In Ubuntu 16.04, when you hold Super key for some seconds, it displays a panel giving the current shortcuts.

If I look for the "expose window" shortcut, sometimes it's Super+Z and sometimes it's Super+W. It doesn't seem to change from a shortcut use to the next one, but rather from one boot to the next one, but I'm not sure.

I use a AZERTY keyboard layout, and the Z and W are one of the letters that swap between AZERTY and QWERTY.

I don't know what triggers the choice of one or the other, maybe this is at Unity boot. I suspects that sometimes it initializes the shortcuts *before* the keyboard layout, and sometimes *after*, but that's just a user point of view.

One day I will expose windows with Super+Z and another day with Super+W, without to change anything in keyboard layout or shortcuts.

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$ lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04
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$ apt-cache policy keyboard-configuration
keyboard-configuration:
  Installé : 1.108ubuntu15
  Candidat : 1.108ubuntu15
 Table de version :
 *** 1.108ubuntu15 500
        500 http://fr.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://fr.archive.ubuntu.com/ubuntu xenial/main i386 Packages
        100 /var/lib/dpkg/status
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Expected : Shortcuts should never change without an user intervention
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ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: keyboard-configuration 1.108ubuntu15
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Thu May 19 23:31:14 2016
InstallationDate: Installed on 2016-04-22 (27 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: console-setup
UpgradeStatus: No upgrade log present (probably fresh install)