Try holding down the option key on restart, does it show the CD rom there? If no-go then zap the PRAM by holding down the cmd (left open apple key) & option & "p" & "r" keys (you need four fingers...
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Try holding down the option key on restart, does it show the CD rom there? If no-go then zap the PRAM by holding down the cmd (left open apple key) & option & "p" & "r" keys (you need four fingers...
Try holding down the C key with the Ubuntu CD-rom in the drive, it should start booting from the CD at that point.