I have installed qemu and then downloaded the 4.3 iso from android x86 site and started this way to detect partitions on the main drive
qemu -boot d -cdrom android-x86-4.3-20130725.iso -hda /dev/sda
format the partition already prepared in my case 15G /dev/sda4 also do not install grub if you want to modify it manually from debian partition
After the install is finished you need to test it first that it works i mount /dev/sda4 to see the dir structure
mount /dev/sda4 /mnt ls /mnt/ android-4.3-test lost+foundso i have modified /etc/grub.d/40_custom this way
menuentry "Android-x86 4.3" {
set root=(hd0,4) linux /android-4.3-test/kernel quiet root=/dev/ram0 androidboot_hardware=eeepc acpi_sleep=s3_bios,s3_mode SRC=/android-4.3-test DATA= initrd /android-4.3-test/initrd.img
}
sudo update-grub2
and restart choose the new android version