How to recovery Ubuntu 12.04 just from the .iso file, without CD-ROM

Question

My computer does not have a CD-ROM, so I can not recovery the Ubuntu 12.04 from CD setup disk. I have downloaded the DVD ISO file from Ubuntu website, How can I mount the ISO file, and recovery the system files or make the DVD ISO to be the update source ? The Ubuntu 12.04 can not get the Internet. Thanks.

Answer 1

if you have installed GRUB 2, Grub2/ISOBoot may helps. it permits the user to boot and install Ubuntu directly from an ISO on the hard drive