Pb keyb layout with lightdm after installing iso

Hello

I think I tried everything regarding lightdm ...
I checked with "localectl status", everything seems to be correct during installation.

I have checked and tried changes in every configuration files, I also removed and reinstalled lightdm but my pb remains the same : my layout keyboard is not correct when I want to log in after installation of my PinguyBuilder iso. (in my case keyboard should be in Fr)

(Xubuntu 18.04 fork iso created with pinguybuilder-menu-based_5.2-1_all.deb)

thanks you for your comments, wish you a great day