debootstrap --arch=i386 sid /mnt/ http://deb.debian.org/debian/

# i love arch ?
# arch-chroot /mnt/ /bin/bash
# apt instal arch-install-scripts

# no install apparmor
apt install i3 lightdm network-manager-gnome
apt install linux-image-5.10.0-6-686 grub-pc os-prober

/sbin/grub-install /dev/sda
/sbin/grub-mkconfig -o /boot/grub/grub.cfg

おしえてあげなーい