sudo mkdir -p /var/lib/lightdm/.cache /var/lib/lightdm/data
sudo chown -R lightdm:lightdm /var/lib/lightdm
sudo chmod 0755 /var/lib/lightdm

# Also ensure dbus-user-session for XFCE settings
sudo apt install --reinstall dbus-user-session xfce4-session

sudo systemctl restart lightdm