You can try the export command:
# export LANG=fr_FR.UTF-8
reconfigure locales
# dpkg-reconfigure locales
Type: Posts; User: OmegaMK-XII
You can try the export command:
# export LANG=fr_FR.UTF-8
reconfigure locales
# dpkg-reconfigure locales
Try:
dpkg-reconfigure gdm
and choose lightdm