Untitled

sudo -i

cryptsetup luksOpen /dev/sda3 tmpluks

mount -o subvol=@,defaults /dev/mapper/tmpluks /mnt

for dir in sys dev proc;do
mount -v --rbind "/${dir}" "/mnt/${dir}"
mount -v --make-rslave "/mnt/${dir}"
done

chroot /mnt /bin/bash
mount -va