debootstrap: Enable ttyS0 too

debootstrap-stage2

@@ -52,7 +52,7 @@ else
 	apt install -yy grub-pc
 fi
 if ! grep -q 'console serial' /etc/default/grub; then
-    sed -i /etc/default/grub -e "s/GRUB_CMDLINE_LINUX_DEFAULT=\"quiet\"/GRUB_CMDLINE_LINUX_DEFAULT=\"quiet console=tty0 console=ttyS1,$SERIAL_SPEED\"/"
+    sed -i /etc/default/grub -e "s/GRUB_CMDLINE_LINUX_DEFAULT=\"quiet\"/GRUB_CMDLINE_LINUX_DEFAULT=\"quiet console=tty0 console=ttyS0,$SERIAL_SPEED console=ttyS1,$SERIAL_SPEED\"/"
     cat >> /etc/default/grub <<EOF
 # Preload both GPT and MBR modules so that they are not missed
 GRUB_PRELOAD_MODULES="part_gpt part_msdos lvm"