Ubuntu iso to usb image

[箛絕]

open a terminal login as root and do as follow:
1.mkdir -p /mnt/iso
 /*
mkdir a directory /mnt/iso
*/
 2.cp xxx.iso /
 /*
copy the iso image to / ,xxx.iso means the path of the iso image
*/
 3.cd / && mount -o loop -t iso9660 xxx.iso /mnt/iso 
 /*
cd / ,and the mount the iso image to /mnt/iso ,xxx.iso means the path of ubuntu's iso image
*/
 3.cd /mnt/iso/casper && cp vmlinuz initrd.lz /
 /*
cd /mnt/iso/casper and copy the linux kernel and initd file to /
*/
 4.modify the grub configure file ,gedit /boot/grub/menu.lst or vi /boot/grub/menu.lst
append the follow text to end of the file
 title install Ubuntu
find --set-root /xxx.iso
kernel vmlinuz boot=casper iso-scan/filename=/xxx.iso ro quiet splash
initrd initrd.lz

 Hope it can help you !
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