[ubuntu] installing via bootalbe USB

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http://ubuntuforums.org – Hi, I am trying to install ubuntu linux from a bootable pendrive on my sony waio PCG 7D2L. But I couldn't get it to boot from the pen drive. I set my boot order to Optical drive Network Floppy Disk Drive HDD there is no USB option present. Also the CDROM is dead so USB boot is the only option. Can anyone please suggest how to boot it from the USB. The above order just boots the existing windows XP. The bootable USB works fine with my other Dell laptop. I thought I would look into the Network boot if everything else fails. Is there any way of using my existing harddrive to use to (Hardware)