Problem with booting, in Dell N5010

[GreyZer0]

Hi everyone,

i've a problem with booing in ubuntu 11.04 and 11.10 in my laptop dell
inspiron N5010,
i configured the BIOS to boot from the CD/DVD first, but it didn't boot. i
don't know why!?
by the way i booted another OS and it's boots well!

anyone can help me please?

Thanks.
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