proot.sh

unset LD_PRELOAD
command="proot"
command+=" --link2symlink"
command+=" -0"
#archurl="arm64"
#wget https://raw.githubusercontent.com/EXALAB/AnLinux-Resources/master/Rootfs/Ubuntu/${archurl}/ubuntu-rootfs-${archurl}.tar.xz
#mkdir ubuntu-fs && proot --link2symlink tar -xJf ubuntu-rootfs-${archurl}.tar.xz -C ubuntu-fs 
command+=" -r ubuntu-fs"
command+=" -b /dev"
command+=" -b /proc"
command+=" -b ubuntu-fs/root:/dev/shm"
#command+=" -b $HOME:/root"
#command+=" -b /sdcard"
command+=" -w /root"
command+=" /usr/bin/env -i"
command+=" HOME=/root"
command+=" PATH=/usr/local/sbin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/games:/usr/local/games"
command+=" TERM=$TERM"
command+=" LANG=C.UTF-8"
command+=" /bin/bash --login"

exec $command

bootstrap extracted folder from "http://cdimage.ubuntu.com/ubuntu-base/releases/18.04/release/ubuntu-base-18.04.5-base-arm64.tar.gz" before proot