Make a USB Boot CD for Ubuntu ▷ Pendrive Linux

Make a USB Boot CD for Ubuntu that can be used to boot your Ubuntu Live USB flash drive from a PC or Mac with a BIOS that doesn't natively support booting from USB devices. (the USB drivers are loaded from CD). I used a MacBook Pro to test this tutorial. This process replaces our older USB Boot CD for Ubuntu tutorial, with new requirements added to make it work with later versions.

A boot menu option has been included for booting from a MacBook (forcing bypass of the Nouveau Nvidia drivers, which do not play well with a MacBook.).

Prerequisites to make a USB Boot CD for Ubuntu

PC or MacBook that can Boot from a Live CD
USB flash drive with Ubuntu preinstalled
Working CD Burner and USB Port
Active Internet Connection

How to make a USB Boot CD for Ubuntu

Note: I prefer to perform the following steps by booting from a prebuilt Live Ubuntu flash drive created using UUI, using a machine that does support booting from USB. This allows us to free up the CD Burner and use it to burn the final ISO.

Insert your Bootable Ubuntu Live USB (or Ubuntu CD) and restart your computer, booting from the CD or USB
Open a Terminal, and type or copy each of the following lines:
To update, type:
```
sudo apt-get update
```

To install nvidia and grub:

sudo apt-get install --reinstall nvidia-current grub

To make a temporary working path:
```
mkdir -p ubcd/boot/grub
```

To add the necessary ISO/CD boot files:

cp /usr/lib/grub/i386-pc/stage2_eltorito ubcd/boot/grub

To open grub menu for editing:
```
gedit ubcd/boot/grub/menu.lst
```
Add the following information to your menu.lst file and click save:

title Start Ubuntu from USB DISK (MACBOOK)
root (cd)
kernel /boot/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper noprompt cdrom-detect/try-usb=true persistent nouveau.noaccel=1 blacklist=vga16fb
initrd /boot/initrd.lz
boot

title Start Ubuntu from USB DISK (PC)
root (cd)
kernel /boot/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper noprompt cdrom-detect/try-usb=true persistent
initrd /boot/initrd.lz
boot

Then to copy vmlinuz to the temporary direcxtory, type:
```
cp /cdrom/casper/vmlinuz ~/ubcd/boot
```

To edit the modules file, type:

sudo gedit /etc/initramfs-tools/modules

Add the following lines to the modules file and click save:

usbcore
usb-storage
uhci_hcd
ohci_hcd
ehci_hcd
sd_mod
scsi_mod

Type the following to open and begin editing initramfs.conf
```
sudo gedit /etc/initramfs-tools/initramfs.conf
```
Add the following line to the bottom of the file and click save:
```
WAIT=8
```
Then to rebuild initramfs, type:
```
sudo mkinitramfs -o ubcd/boot/initrd.lz
```

Finally, to make a new Ubuntu ISO, type:

mkisofs -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4 -boot-info-table -o usbcd.iso ubcd

Insert a blank CD and type brasero -i usbcd.iso (to burn the usbcd.iso to a CD)