diff --git a/scripts/build.sh b/scripts/build.sh
new file mode 100755
index 0000000..aa8822d
--- /dev/null
+++ b/scripts/build.sh
@@ -0,0 +1,278 @@
+#!/bin/bash
+
+set -e # exit on error
+set -o pipefail # exit on pipeline error
+set -u # treat unset variable as error
+#set -x
+
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+
+CMD=(setup_host debootstrap run_chroot build_iso)
+
+DATE=`TZ="UTC" date +"%y%m%d-%H%M%S"`
+
+function help() {
+ # if $1 is set, use $1 as headline message in help()
+ if [ -z ${1+x} ]; then
+ echo -e "This script builds bootable ubuntu ISO image"
+ echo -e
+ else
+ echo -e $1
+ echo
+ fi
+ echo -e "Supported commands : ${CMD[*]}"
+ echo -e
+ echo -e "Syntax: $0 [start_cmd] [-] [end_cmd]"
+ echo -e "\trun from start_cmd to end_end"
+ echo -e "\tif start_cmd is omitted, start from first command"
+ echo -e "\tif end_cmd is omitted, end with last command"
+ echo -e "\tenter single cmd to run the specific command"
+ echo -e "\tenter '-' as only argument to run all commands"
+ echo -e
+ exit 0
+}
+
+function find_index() {
+ local ret;
+ local i;
+ for ((i=0; i<${#CMD[*]}; i++)); do
+ if [ "${CMD[i]}" == "$1" ]; then
+ index=$i;
+ return;
+ fi
+ done
+ help "Command not found : $1"
+}
+
+function chroot_enter_setup() {
+ sudo mount --bind /dev chroot/dev
+ sudo mount --bind /run chroot/run
+ sudo chroot chroot mount none -t proc /proc
+ sudo chroot chroot mount none -t sysfs /sys
+ sudo chroot chroot mount none -t devpts /dev/pts
+}
+
+function chroot_exit_teardown() {
+ sudo chroot chroot umount /proc
+ sudo chroot chroot umount /sys
+ sudo chroot chroot umount /dev/pts
+ sudo umount chroot/dev
+ sudo umount chroot/run
+}
+
+function check_host() {
+ local os_ver;
+ os_ver=`lsb_release -d | grep "Ubuntu 20.04"`
+ if [[ $os_ver == "" ]]; then
+ echo "WARNING : OS is not Ubuntu 20.04 and is untested"
+ fi
+
+ if [ $(id -u) -eq 0 ]; then
+ echo "This script should not be run as 'root'"
+ exit 1
+ fi
+}
+
+function setup_host() {
+ echo "=====> running setup_host ..."
+ sudo apt update
+ sudo apt install -y binutils debootstrap squashfs-tools xorriso grub-pc-bin grub-efi-amd64-bin mtools
+ sudo mkdir -p chroot
+}
+
+function debootstrap() {
+ echo "=====> running debootstrap ... will take a couple of minutes ..."
+ sudo debootstrap --arch=amd64 --variant=minbase focal chroot http://us.archive.ubuntu.com/ubuntu/
+}
+
+function run_chroot() {
+ echo "=====> running run_chroot ..."
+
+ chroot_enter_setup
+
+ sudo ln -f $SCRIPT_DIR/chroot_build.sh chroot/root/chroot_build.sh
+ sudo cp -f /etc/apt/sources.list chroot/etc/apt/
+ sudo chroot chroot /root/chroot_build.sh -
+ sudo rm -f chroot/root/chroot_build.sh
+
+ chroot_exit_teardown
+}
+
+
+function build_iso() {
+ echo "=====> running build_iso ..."
+
+ rm -rf image
+ mkdir -p image/{casper,isolinux,install}
+
+ # copy kernel files
+ sudo cp chroot/boot/vmlinuz-**-**-generic image/casper/vmlinuz
+ sudo cp chroot/boot/initrd.img-**-**-generic image/casper/initrd
+
+ # memtest86
+ sudo cp chroot/boot/memtest86+.bin image/install/memtest86+
+
+ wget --progress=dot https://www.memtest86.com/downloads/memtest86-usb.zip -O image/install/memtest86-usb.zip
+ unzip -p image/install/memtest86-usb.zip memtest86-usb.img > image/install/memtest86
+ rm -f image/install/memtest86-usb.zip
+
+ # grub
+ touch image/ubuntu
+ cat <<EOF > image/isolinux/grub.cfg
+
+search --set=root --file /ubuntu
+
+insmod all_video
+
+set default="0"
+set timeout=30
+
+menuentry "Try Ubuntu FS without installing" {
+ linux /casper/vmlinuz boot=casper nopersistent toram quiet splash ---
+ initrd /casper/initrd
+}
+
+menuentry "Install Ubuntu FS" {
+ linux /casper/vmlinuz boot=casper only-ubiquity quiet splash ---
+ initrd /casper/initrd
+}
+
+menuentry "Check disc for defects" {
+ linux /casper/vmlinuz boot=casper integrity-check quiet splash ---
+ initrd /casper/initrd
+}
+
+menuentry "Test memory Memtest86+ (BIOS)" {
+ linux16 /install/memtest86+
+}
+
+menuentry "Test memory Memtest86 (UEFI, long load time)" {
+ insmod part_gpt
+ insmod search_fs_uuid
+ insmod chain
+ loopback loop /install/memtest86
+ chainloader (loop,gpt1)/efi/boot/BOOTX64.efi
+}
+EOF
+
+ # generate manifest
+ sudo chroot chroot dpkg-query -W --showformat='${Package} ${Version}\n' | sudo tee image/casper/filesystem.manifest
+ sudo cp -v image/casper/filesystem.manifest image/casper/filesystem.manifest-desktop
+ sudo sed -i '/ubiquity/d' image/casper/filesystem.manifest-desktop
+ sudo sed -i '/casper/d' image/casper/filesystem.manifest-desktop
+ sudo sed -i '/discover/d' image/casper/filesystem.manifest-desktop
+ sudo sed -i '/laptop-detect/d' image/casper/filesystem.manifest-desktop
+ sudo sed -i '/os-prober/d' image/casper/filesystem.manifest-desktop
+
+ # compress rootfs
+ sudo mksquashfs chroot image/casper/filesystem.squashfs
+ printf $(sudo du -sx --block-size=1 chroot | cut -f1) > image/casper/filesystem.size
+
+ # create diskdefines
+ cat <<EOF > image/README.diskdefines
+#define DISKNAME Ubuntu from scratch
+#define TYPE binary
+#define TYPEbinary 1
+#define ARCH amd64
+#define ARCHamd64 1
+#define DISKNUM 1
+#define DISKNUM1 1
+#define TOTALNUM 0
+#define TOTALNUM0 1
+EOF
+
+ # create iso image
+ pushd $SCRIPT_DIR/image
+ grub-mkstandalone \
+ --format=x86_64-efi \
+ --output=isolinux/bootx64.efi \
+ --locales="" \
+ --fonts="" \
+ "boot/grub/grub.cfg=isolinux/grub.cfg"
+
+ (
+ cd isolinux && \
+ dd if=/dev/zero of=efiboot.img bs=1M count=10 && \
+ sudo mkfs.vfat efiboot.img && \
+ LC_CTYPE=C mmd -i efiboot.img efi efi/boot && \
+ LC_CTYPE=C mcopy -i efiboot.img ./bootx64.efi ::efi/boot/
+ )
+
+ grub-mkstandalone \
+ --format=i386-pc \
+ --output=isolinux/core.img \
+ --install-modules="linux16 linux normal iso9660 biosdisk memdisk search tar ls" \
+ --modules="linux16 linux normal iso9660 biosdisk search" \
+ --locales="" \
+ --fonts="" \
+ "boot/grub/grub.cfg=isolinux/grub.cfg"
+
+ cat /usr/lib/grub/i386-pc/cdboot.img isolinux/core.img > isolinux/bios.img
+
+ sudo /bin/bash -c "(find . -type f -print0 | xargs -0 md5sum | grep -v -e 'md5sum.txt' -e 'bios.img' -e 'efiboot.img' > md5sum.txt)"
+
+ sudo xorriso \
+ -as mkisofs \
+ -iso-level 3 \
+ -full-iso9660-filenames \
+ -volid "Ubuntu from scratch" \
+ -eltorito-boot boot/grub/bios.img \
+ -no-emul-boot \
+ -boot-load-size 4 \
+ -boot-info-table \
+ --eltorito-catalog boot/grub/boot.cat \
+ --grub2-boot-info \
+ --grub2-mbr /usr/lib/grub/i386-pc/boot_hybrid.img \
+ -eltorito-alt-boot \
+ -e EFI/efiboot.img \
+ -no-emul-boot \
+ -append_partition 2 0xef isolinux/efiboot.img \
+ -output "../ubuntu-from-scratch.iso" \
+ -m "isolinux/efiboot.img" \
+ -m "isolinux/bios.img" \
+ -graft-points \
+ "/EFI/efiboot.img=isolinux/efiboot.img" \
+ "/boot/grub/bios.img=isolinux/bios.img" \
+ "."
+
+ popd
+}
+
+# ============= main ================
+
+# we always stay in $SCRIPT_DIR
+cd $SCRIPT_DIR
+
+check_host
+
+# check number of args
+if [[ $# == 0 || $# > 3 ]]; then help; fi
+
+# loop through args
+dash_flag=false
+start_index=0
+end_index=${#CMD[*]}
+for ii in "$@";
+do
+ if [[ $ii == "-" ]]; then
+ dash_flag=true
+ continue
+ fi
+ find_index $ii
+ if [[ $dash_flag == false ]]; then
+ start_index=$index
+ else
+ end_index=$(($index+1))
+ fi
+done
+if [[ $dash_flag == false ]]; then
+ end_index=$(($start_index + 1))
+fi
+
+#loop through the commands
+for ((ii=$start_index; ii<$end_index; ii++)); do
+ ${CMD[ii]}
+done
+
+echo "$0 - Initial build is done!"
+
diff --git a/scripts/chroot_build.sh b/scripts/chroot_build.sh
new file mode 100755
index 0000000..1f8d684
--- /dev/null
+++ b/scripts/chroot_build.sh
@@ -0,0 +1,196 @@
+#!/bin/bash
+
+set -e # exit on error
+set -o pipefail # exit on pipeline error
+set -u # treat unset variable as error
+#set -x
+
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+
+CMD=(setup_host install_pkg finish_up)
+
+function help() {
+ # if $1 is set, use $1 as headline message in help()
+ if [ -z ${1+x} ]; then
+ echo -e "This script builds Ubuntu from scratch"
+ echo -e
+ else
+ echo -e $1
+ echo
+ fi
+ echo -e "Supported commands : ${CMD[*]}"
+ echo -e
+ echo -e "Syntax: $0 [start_cmd] [-] [end_cmd]"
+ echo -e "\trun from start_cmd to end_end"
+ echo -e "\tif start_cmd is omitted, start from first command"
+ echo -e "\tif end_cmd is omitted, end with last command"
+ echo -e "\tenter single cmd to run the specific command"
+ echo -e "\tenter '-' as only argument to run all commands"
+ echo -e
+ exit 0
+}
+
+function find_index() {
+ local ret;
+ local i;
+ for ((i=0; i<${#CMD[*]}; i++)); do
+ if [ "${CMD[i]}" == "$1" ]; then
+ index=$i;
+ return;
+ fi
+ done
+ help "Command not found : $1"
+}
+
+function check_host() {
+ if [ $(id -u) -ne 0 ]; then
+ echo "This script should be run as 'root'"
+ exit 1
+ fi
+
+ export HOME=/root
+ export LC_ALL=C
+}
+
+function setup_host() {
+ echo "=====> running setup_host ..."
+
+ echo "ubuntu-fs-live" > /etc/hostname
+
+ # we need to install systemd first, to configure machine id
+ apt-get update
+ apt-get install -y libterm-readline-gnu-perl systemd-sysv
+
+ #configure machine id
+ dbus-uuidgen > /etc/machine-id
+ ln -fs /etc/machine-id /var/lib/dbus/machine-id
+
+ # don't understand why, but multiple sources indicate this
+ dpkg-divert --local --rename --add /sbin/initctl
+ ln -s /bin/true /sbin/initctl
+}
+
+function install_pkg() {
+ echo "=====> running install_pkg ... will take a long time ..."
+ apt-get -y upgrade
+
+ # install live linux packages
+ apt-get install -y \
+ ubuntu-standard \
+ casper \
+ lupin-casper \
+ discover \
+ laptop-detect \
+ os-prober \
+ network-manager \
+ resolvconf \
+ net-tools \
+ wireless-tools \
+ wpagui \
+ locales \
+ linux-generic
+
+ # graphic installer - ubiquity
+ apt-get install -y \
+ ubiquity \
+ ubiquity-casper \
+ ubiquity-frontend-gtk \
+ ubiquity-slideshow-ubuntu \
+ ubiquity-ubuntu-artwork
+
+ # install graphics and desktop
+ apt-get install -y \
+ plymouth-theme-ubuntu-logo \
+ ubuntu-gnome-desktop \
+ ubuntu-gnome-wallpapers
+
+ # useful tools
+ apt-get install -y \
+ clamav-daemon \
+ terminator \
+ apt-transport-https \
+ curl \
+ vim \
+ nano \
+ less
+
+ # purge
+ apt-get purge -y \
+ transmission-gtk \
+ transmission-common \
+ gnome-mahjongg \
+ gnome-mines \
+ gnome-sudoku \
+ aisleriot \
+ hitori
+
+ # remove unused and clean up apt cache
+ apt-get autoremove -y
+
+ # final touch
+ dpkg-reconfigure locales
+ dpkg-reconfigure resolvconf
+
+ # network manager
+ cat <<EOF > /etc/NetworkManager/NetworkManager.conf
+[main]
+rc-manager=resolvconf
+plugins=ifupdown,keyfile
+dns=dnsmasq
+
+[ifupdown]
+managed=false
+EOF
+ dpkg-reconfigure network-manager
+
+ apt-get clean -y
+}
+
+function finish_up() {
+ echo "=====> finish_up"
+
+ # truncate machine id (why??)
+ truncate -s 0 /etc/machine-id
+
+ # remove diversion (why??)
+ rm /sbin/initctl
+ dpkg-divert --rename --remove /sbin/initctl
+
+ rm -rf /tmp/* ~/.bash_history
+}
+
+# ============= main ================
+
+check_host
+
+# check number of args
+if [[ $# == 0 || $# > 3 ]]; then help; fi
+
+# loop through args
+dash_flag=false
+start_index=0
+end_index=${#CMD[*]}
+for ii in "$@";
+do
+ if [[ $ii == "-" ]]; then
+ dash_flag=true
+ continue
+ fi
+ find_index $ii
+ if [[ $dash_flag == false ]]; then
+ start_index=$index
+ else
+ end_index=$(($index+1))
+ fi
+done
+if [[ $dash_flag == false ]]; then
+ end_index=$(($start_index + 1))
+fi
+
+# loop through the commands
+for ((ii=$start_index; ii<$end_index; ii++)); do
+ ${CMD[ii]}
+done
+
+echo "$0 - Initial build is done!"
+