Kill Android GUI
setprop ctl.stop media & setprop ctl.stop zygote

Restart Android GUI
setprop ctl.start media & setprop ctl.start zygote

#mount chroot img;cd into folder and other mounts
mount -o loop -t ext4 debian_arm.img deb
cd deb
busybox mount --bind /dev dev

mount -t devpts devpts dev/pts
mount -t proc proc proc
mount -t sysfs sysfs sys
chroot . /bin/bash

#and link fb0
ln -s /dev/graphics/fb0 /dev/fb0

startx -- vt1 &

#find display 

cd /tmp/.X11-unix && for x in X*; do echo ":${x#X}"; done

#set display

export DISPLAY=:1