@mgriepentrog , whops you're right. My iMacs were SMC (the About this Mack->More information->hardware had "SMC version: 1.8f2" and not an EFI version. So Juan C Nuno's link worked for that. I failed to spot that the distinction before posting. So i confirm that ubuntu maverick image only for SMC firmware iMacs and not EFI ones.
@mgriepentrog , whops you're right. My iMacs were SMC (the About this Mack->More information- >hardware had "SMC version: 1.8f2" and not an EFI version. So Juan C Nuno's link worked for that. I failed to spot that the distinction before posting. So i confirm that ubuntu maverick image only for SMC firmware iMacs and not EFI ones.