problem recognizing usb bootable when installing ubuntu

[poleapple]

I currently am dual booting linux mint and windows 7. My only hard drive is partitioned in two, one for linux mint and one for windows 7. I installed linux mint with a usb bootable.

I want to replace my linux mint with ubuntu, however, my the usb bootable ubuntu isn't being recognized. I restart the laptop with the usb inside, but it just goes to the grub screen that lets me choose between linux mint or windows 7. The boot order has USB in first position as well. I used the usb creator as suggested on the ubuntu downloads page to create a usb bootable too. I've done this installation before with both ubuntu and mint... but now it's not working.

I tried "sudo update-grub" within linux mint with the usb plugged in, and restarting afterwards, but I still can't see the usb in the grub screen.

Anyone know why?

Thanks for the help.

[poleapple]

BUMP anyone?

[electroman6913]

go through your Bios some more. on my laptop I had to change two settings to get it to boot from USB. you might have to enable the usb device in the bios as well as making it the first boot device.

[nguill00]

First format flash drive fat32
Second go to system>administration>startup disk creator
use the ubuntu cd or .iso to create your usb boot installation medium. ...I slide the bar to use 4gb ...fyi...I used an 8gb thumb drive. I have packages and personal data that I store on mine...
Reboot the pc... set up usb boot in bios...if your using 10.04 ot later ...I always press the esc key when it shows the handicap icon then choose the selection that I want...another fyi

Manually partition the hd...
Delete the partitions you want...I think you know the rest...