Install screen to enable console locking

src/freedombone-utils-setup

     apt-get -yq install libnss-gw-name nano man ntp locales locales-all debconf
     apt-get -yq install wireless-tools wpasupplicant usbutils cryptsetup zsh
     apt-get -yq install pinentry-curses eatmydata iotop bc grub2 hostapd haveged
-    apt-get -yq install cpulimit
+    apt-get -yq install cpulimit screen
 
     if [ ! -d $INSTALL_DIR ]; then
         mkdir -p $INSTALL_DIR