This will take your current OS and make it into a Live ISO!
Now your custom ISO is in custom-backup
DONT USE remastersys DIST ## It created LiveISO with only Guest Account but no Sudo Password!
Note that it works as is, but I don't like the custom splash screen and the other customizations, so I like to extract the casper/filesystem* files and place inside the stock ISO, there are instructions below. Another Thing to note is that it doesn't copy /etc/network/interfaces. I created a script that echo'd my configs to /etc/network/interfaces and then ran the proper commands.
[Update] The eth0 works fine with the stock /interfaces, its the wifi that needed echoing. Don't use RC.local for this, use cron @reboot /wlan0.sh. Example Here
--Remastersys does copy wpa_supplicant.
Now Use ISO Master to extract the /casper/filesystem* files from the custom ISO and place it inside Ubuntu Stock ISO.
You will need to replace isolinux.cfg as well Skip Try it before you Install it Screen