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Live custom Ubuntu from scratch

Prerequisites (GNU/Linux Debian/Ubuntu)

Install applications we need to build the environment.

sudo apt-get install \
    debootstrap \
    squashfs-tools \
    genisoimage \
    syslinux \
    isolinux

mkdir $HOME/live-ubuntu-from-scratch

Bootstrap and Configure Ubuntu

sudo debootstrap \
    --arch=amd64 \
    --variant=minbase \
    bionic \
    $HOME/live-ubuntu-from-scratch/chroot \
    http://us.archive.ubuntu.com/ubuntu/

sudo mount --bind /dev $HOME/live-ubuntu-from-scratch/chroot/dev

sudo mount --bind /run $HOME/live-ubuntu-from-scratch/chroot/run

sudo chroot $HOME/live-ubuntu-from-scratch/chroot

mount none -t proc /proc

mount none -t sysfs /sys

mount none -t devpts /dev/pts

export HOME=/root

export LC_ALL=C

Set a custom hostname

echo "ubuntu-live" > /etc/hostname

Configure apt sources.list

Edit /etc/apt/source.list

cat <<EOF > /etc/apt/sources.list
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse 

deb http://us.archive.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse 

deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse 
EOF

Upgrade packages if you want

apt-get update

apt-get -y upgrade

Install and configure dbus

apt-get install -y systemd-sysv

apt-get install -y dbus

dbus-uuidgen > /var/lib/dbus/machine-id

dpkg-divert --local --rename --add /sbin/initctl

ln -s /bin/true /sbin/initctl

Install packages needed for Live System

apt-get install -y \
    ubuntu-standard \
    casper \
    lupin-casper \
    discover \
    laptop-detect \
    os-prober \
    network-manager \
    linux-generic

Graphical installer

apt-get install -y \
    ubiquity \
    ubiquity-casper \
    ubiquity-frontend-gtk \
    ubiquity-slideshow-ubuntu \
    ubiquity-ubuntu-artwork

Install window manager

apt-get install -y \
    plymouth-theme-ubuntu-gnome-logo \
    ubuntu-gnome-desktop \
    ubuntu-gnome-wallpapers

Install usefull applications

apt-get install -y \
    clamav-daemon \
    terminator \
    apt-transport-https \
    curl \
    vim \
    nano

Install Visual Studio Code

Download and install the key

curl https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.gpg

install -o root -g root -m 644 microsoft.gpg /etc/apt/trusted.gpg.d/

echo "deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main" > /etc/apt/sources.list.d/vscode.list

rm microsoft.gpg

Then update the package cache and install the package using:
```
apt-get update

apt-get install -y code
```

Install Google Chrome

Download and install the key

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

Add the key to the repository

echo "deb http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list

Finally, Update repository and install Google Chrome.

apt-get update

apt-get install google-chrome-stable

Install Java JDK 8

apt-get install -y \
    openjdk-8-jdk \
    openjdk-8-jre

Remove unused applications

apt-get purge -y \
    transmission-gtk \
    transmission-common \
    gnome-mahjongg \
    gnome-mines \
    gnome-sudoku \
    aisleriot \
    hitori

Remove unused packages

apt-get autoremove -y

Cleanup the chroot environment

If you installed software, be sure to run
```
rm /var/lib/dbus/machine-id
```

Remove the diversion

rm /sbin/initctl

dpkg-divert --rename --remove /sbin/initctl

Clean up

apt-get clean

rm -rf /tmp/*

rm /etc/resolv.conf

umount /proc

umount /sys

umount /dev/pts

exit

Unbind mount points

sudo umount $HOME/live-ubuntu-from-scratch/chroot/dev

sudo umount $HOME/live-ubuntu-from-scratch/chroot/run

Create the CD image directory and populate it

Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```

Create directories

mkdir -p image/{casper,isolinux,install}

Copy kernel images

cp chroot/boot/vmlinuz-**-**-generic image/casper/vmlinuz

cp chroot/boot/initrd.img-**-**-generic image/casper/initrd.gz

Copy isolinux and memtest binaries

cp /usr/lib/ISOLINUX/isolinux.bin image/isolinux/

cp /usr/lib/syslinux/modules/bios/ldlinux.c32 image/isolinux/

cp /boot/memtest86+.bin image/install/memtest

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