Custom Xubuntu 15.04 ISO

process.sh

#!/bin/bash

##################################
# Note: 
# DO NOT EXECUTE THIS SCRIPT.
# THIS IS JUST A GUIDE.
#################################

##################################
# Assumes you are in ~/CustomCD
#
# Place any .deb packages / files
# in ~/CustomCD/offline to be
# copied and made available in 
# CHROOT environment
#################################

##########################
# Setup
##########################

mkdir /tmp/livecd
sudo mount -o loop ~/Downloads/OS/xubuntu-15.04-desktop-amd64.iso /tmp/livecd
mkdir -p ~/livecd/cd 
rsync --exclude=/casper/filesystem.squashfs -a /tmp/livecd/ ~/livecd/cd
mkdir ~/livecd/squashfs ~/livecd/custom 
sudo modprobe squashfs
sudo mount -t squashfs -o loop /tmp/livecd/casper/filesystem.squashfs ~/livecd/squashfs/ 
sudo cp -a ~/livecd/squashfs/* ~/livecd/custom

##########################
# CHROOT
##########################

sudo cp -r ~/CustomCD/offline/. ~/livecd/custom/root/files/
echo "Copied offline files to /root/files ........."
sudo cp /etc/resolv.conf /etc/hosts ~/livecd/custom/etc/
sudo chroot ~/livecd/custom /bin/bash -l 

##########################
# Setup CHROOT
##########################

mount -t proc none /proc/ 
mount -t sysfs none /sys/
export HOME=/root
export LC_ALL=C
dbus-uuidgen > /var/lib/dbus/machine-id
dpkg-divert --local --rename --add /sbin/initctl
ln -s /bin/true /sbin/initctl
ln -s /usr/share/initramfs-tools/scripts

##########################
# Install & Remove 
# Packages / Kernel
# from CHROOT
##########################

dpkg -i /root/files/*
apt-get remove linux-image-3*

##########################
# Clean and Exit CHROOT
##########################

rm /var/lib/dbus/machine-id
rm /sbin/initctl
rm /scripts
dpkg-divert --rename --remove /sbin/initctl
rm -r /root/files
apt-get clean
rm -rf /tmp/*
umount /proc/
umount /sys/
exit

##########################
# Copy Kernel to Live CD
##########################

sudo cp ~/livecd/custom/vmlinuz ~/livecd/cd/casper/vmlinuz.efi

sudo gzip -dc ~/livecd/custom/initrd.img | sudo lzma -7 > ~/livecd/custom/initrd.lz
sudo mv ~/livecd/custom/initrd.lz ~/livecd/cd/casper/initrd.lz

##########################
# Create ISO
##########################

chmod +w ~/livecd/cd/casper/filesystem.manifest
sudo chroot ~/livecd/custom dpkg-query -W --showformat='${Package} ${Version}\n' > ~/livecd/cd/casper/filesystem.manifest 
sudo cp ~/livecd/cd/casper/filesystem.manifest ~/livecd/cd/casper/filesystem.manifest-desktop
sudo mksquashfs ~/livecd/custom ~/livecd/cd/casper/filesystem.squashfs
sudo rm ~/livecd/cd/md5sum.txt
sudo bash -c 'cd ~/livecd/cd && find . -type f -exec md5sum {} +' > md5sum.txt
sudo mv md5sum.txt ~/livecd/cd/md5sum.txt
cd ~/livecd/cd 
sudo mkisofs -r -V "Ubuntu Live" -b isolinux/isolinux.bin -c isolinux/boot.cat -cache-inodes -J -l -no-emul-boot -boot-load-size 4 -boot-info-table -o ~/Downloads/OS/xubuntu-15.04-4.1-MPC-desktop-amd64.iso .
sudo chmod 777 ~/Downloads/OS/xubuntu-15.04-4.1-MPC-desktop-amd64.iso

##########################
# Cleanup
##########################

sudo umount ~/livecd/squashfs/ 
sudo umount /tmp/livecd 
rm -r /tmp/livecd
sudo rm -fr ~/livecd/