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Thread: Can Natty boot from UEFI bios? grub error

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a friend having trouble booting natty live cd in order install ubuntu. grub giving error message "error: prefix not set". or when tries boot cd.

friend speculating can't boot because it's uefi drive. got lenovo thinkpad.

in theory, ubuntu 11.04 can install fine on uefi-based system. in practice, it's extremely flaky. have 3 suggestions:

suggestion 1

switch computer bios mode (most uefi firmwares have bios boot mode option), install way, install uefi-capable boot loader, , reboot in uefi mode. (alternatively, if don't need uefi mode for, say, gpt support in windows, continue boot installed system in bios mode.) may best solution.

suggestion 2

try following commands, or variants of them, @ grub> prompt:

code:
set prefix=(cd0)/boot/grub set root=(cd0) insmod normal normal
i'm not 100% "(cd0)" correct device name, though. type "ls" see devices present.

suggestion 3

try copying installation files fat-formatted usb flash drive , installing elilo drive. you'll need create elilo.conf file references linux kernel , initial ram disk on usb flash drive. you'll have use uefi firmware's boot loader locate , run elilo.efi file usb flash drive.


Forum The Ubuntu Forum Community Ubuntu Official Flavours Support General Help [ubuntu] Can Natty boot from UEFI bios? grub error


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