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This was how I used to do it:

  1. Download Ubuntu Desktop ISO to PC.

  2. Burn ISO to CD.

  3. Boot from CD and select Install Ubuntu.

  4. Select to install to 8 GB USB stick AND set GRUB to USB Stick.

The result of this is that if I boot my laptop WITHOUT the USB Stick plugged in, it will boot directly to Windows 7. However, as and when I need to boot to Ubuntu, I just plug in the USB stick and restart the laptop. It will then boot to GRUB which gives me the option of booting to Ubuntu or booting to Windows.

The KEY to all this is to create Ubuntu boot CD but now I'm not able to with 12.10 because the ISO size is more than 700MB. I've read some threads that mention try burning to DVD-R instead. Tried that but didn't work. (Yes, I choose to burn img (ISO) to disc instead of burn file to disc). I'm using Nero Burning ROM app to do the burning.

So how do I create a Ubuntu 12.10 Desktop LiveCD or LiveDVD using the 753MB ISO ?

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I don't see how the ISO being larger than 700mb could make it un-bootable when burned to a DVD - I was always using DVDs even when the ISOs were less than 700Mb. I'm pretty sure the problem is somewhere else. – Sergey Dec 30 '12 at 1:14

Use a small 1-2G usb to create a "startup disk" instead of the CD. The only glitch is bug 384633, which results in a wrong, unbootable grub.cfg being created. Edit the grub (instructions are on screen at the bottom) info at first boot, reducing the disk by one letter, (change sdc1 to sdb1 in the search and linux lines) and at first successful boot, run

sudo update-grub 

to fix things up. Feel free to add yourself to the bug, and maybe someday it will be fixed.

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