Custom Linux Live CD

Refer: https://www.ostechnix.com/create-custom-ubuntu-live-cd-image/

Install Cubic
Cubic developer has made a PPA to ease the installation process. To install Cubic on your Ubuntu system, run the following commands one by one in your Terminal:

$ sudo apt-add-repository ppa:cubic- wizard/ release
$ sudo apt-key adv --keyserver keyserver. ubuntu. com --recv-keys 6494C6D6997C215E
$ sudo apt update
$ sudo apt install cubic

Live CD Skipping Installation Splash

Refer: http://askubuntu.com/questions/47522/how-to-bypass-try-it-install-screen-when-booting-from-usb-live-session-wit
Release with updates installed:
http://old-releases.ubuntu.com/releases/


$sudo nano /cdrom/syslinux/syslinux.cfg

Replace:

# D-I config version 2.0
include menu.cfg
default vesamenu.c32
prompt 0
timeout 50
ui gfxboot bootlogo

with this for 32-bit:

default live
label live
say Booting an Ubuntu Live session...
kernel /casper/vmlinuz
append file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash noprompt --

with this for 64-bit:

default live
label live
say Booting an Ubuntu Live session...
kernel /casper/vmlinuz.efi
append file=/cdrom/preseed/ubuntu.seed boot=casper persistent initrd=/casper/initrd.lz quiet splash noprompt --