Some additional information about this bug : - Choosing ethernet of wifi with or without additional driver (rtl8168g-2.fw) for network support gives the same error. (n.b. This driver can only be loaded by means of SD card, not by USB drive.... ) - The frozen screen displays -select and install software- running dpkg ..12% -Alt-F3 or other key combinations do not work, the system can only be rebooted by pressing the power button.