live-custom-ubuntu-from-scr.../README.md

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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 \
syslinux-utils \
imagemagick \
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
```
## Access chroot environment
```
sudo chroot $HOME/live-ubuntu-from-scratch/chroot
```
1. **Configure mount points**
```
mount none -t proc /proc
mount none -t sysfs /sys
mount none -t devpts /dev/pts
export HOME=/root
export LC_ALL=C
```
2. **Set a custom hostname**
```
echo "ubuntu-live" > /etc/hostname
```
3. **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
```
4. **Upgrade packages if you want**
```
apt-get update
apt-get -y upgrade
```
5. **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
```
6. **Install packages needed for Live System**
```
apt-get install -y \
ubuntu-standard \
casper \
lupin-casper \
discover \
laptop-detect \
os-prober \
network-manager \
linux-generic
```
7. **Graphical installer**
```
apt-get install -y \
ubiquity \
ubiquity-casper \
ubiquity-frontend-gtk \
ubiquity-slideshow-ubuntu \
ubiquity-ubuntu-artwork
```
8. **Install window manager**
```
apt-get install -y \
plymouth-theme-ubuntu-gnome-logo \
ubuntu-gnome-desktop \
ubuntu-gnome-wallpapers
```
9. **Install usefull applications**
```
apt-get install -y \
clamav-daemon \
terminator \
apt-transport-https \
curl \
vim \
nano
```
10. **Install Visual Studio Code**
1. 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
```
2. Then update the package cache and install the package using:
```
apt-get update
apt-get install -y code
```
11. **Install Google Chrome**
1. Download and install the key
```
wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
```
2. 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
```
3. Finally, Update repository and install Google Chrome.
```
apt-get update
apt-get install google-chrome-stable
```
12. **Install Java JDK 8**
```
apt-get install -y \
openjdk-8-jdk \
openjdk-8-jre
```
13. **Remove unused applications**
```
apt-get purge -y \
transmission-gtk \
transmission-common \
gnome-mahjongg \
gnome-mines \
gnome-sudoku \
aisleriot \
hitori
```
14. **Remove unused packages**
```
apt-get autoremove -y
```
15. **Cleanup the chroot environment**
1. If you installed software, be sure to run
```
rm /var/lib/dbus/machine-id
```
2. Remove the diversion
```
rm /sbin/initctl
dpkg-divert --rename --remove /sbin/initctl
```
3. 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
1. Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```
2. Create directories
```
mkdir -p image/{casper,isolinux,install}
```
2. Copy kernel images
```
sudo cp chroot/boot/vmlinuz-**-**-generic image/casper/vmlinuz
sudo cp chroot/boot/initrd.img-**-**-generic image/casper/initrd.gz
```
3. Copy isolinux and memtest binaries
```
sudo cp /usr/lib/ISOLINUX/isolinux.bin image/isolinux/
sudo cp /usr/lib/syslinux/modules/bios/{chain,gfxboot,ldlinux,libutil,libcom32,vesamenu}.c32 image/isolinux/
sudo cp chroot/boot/memtest86+.bin image/install/memtest
```
## Boot Instructions
1. Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```
2. Create image/isolinux.txt
```
cat <<EOF > image/isolinux.txt
splash.rle
************************************************************************
This is an Ubuntu from scratch Live CD.
For the default live system, enter "live". To run memtest86+, enter "memtest"
************************************************************************
EOF
```
## Splash screen
1. Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```
2. Create image 640x480 in png format (splash.png)
3. Convert png image to ppm (indexed 16 colors)
```
convert +dither -colors 16 splash.png splash.ppm
```
4. Convert ppm to rle
```
ppmtolss16 '#ffffff=7' < splash.ppm > splash.rle
```
5. Move image
```
sudo mv splash.rle image/
```
## Boot-loader configuration
1. Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```
2. Create image/isolinux.cfg
```
cat <<EOF > image/isolinux.cfg
path
include menu.cfg
default vesamenu.c32
prompt 0
timeout 50
EOF
```
3. Create image/menu.cfg
```
cat <<EOF > image/menu.cfg
menu hshift 13
menu width 49
menu margin 8
menu title Installer boot menu
include txt.cfg
```
4. Create image/txt.cfg
```
cat <<EOF > image/txt.cfg
default live
label live
menu label ^Try Ubuntu from scratch without installing
kernel /casper/vmlinuz
append file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd quiet splash ---
label live-install
menu label ^Install Ubuntu from scratch
kernel /casper/vmlinuz
append file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd quiet splash ---
label check
menu label ^Check disc for defects
kernel /casper/vmlinuz
append boot=casper integrity-check initrd=/casper/initrd quiet splash ---
label memtest
menu label Test ^memory
kernel /install/memtest
EOF
```
## Create manifest
1. Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```
2. Generate manifest
```
sudo chroot chroot dpkg-query -W --showformat='${Package} ${Version}\n' | sudo tee image/casper/filesystem.manifest
sudo cp -v image/casper/filesystem.manifest image/casper/filesystem.manifest-desktop
REMOVE='ubiquity ubiquity-frontend-gtk ubiquity-frontend-kde casper lupin-casper live-initramfs user-setup discover1 xresprobe os-prober libdebian-installer4'
for i in $REMOVE
do
sudo sed -i "/${i}/d" image/casper/filesystem.manifest-desktop
done
```
## Compress the chroot
1. Access build directory
```
cd $HOME/live-ubuntu-from-scratch
```
2. Create squashfs
```
sudo mksquashfs chroot image/casper/filesystem.squashfs
```
3. Write the filesystem.size
```
printf $(sudo du -sx --block-size=1 chroot | cut -f1) > image/casper/filesystem.size
```