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I think the title sums up the question. I want to install Ubuntu via EFI, but I don't want to eliminate the OSX partition either (and I'd still like to be able to boot either).

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Yes, as fossfreedom says, you can install Ubuntu in EFI mode on a Mac. One caveat is that hardware support seems variable (and is constantly changing). Some people swear that important hardware (like video devices) don't work properly in EFI mode. Others have no problems. As a general rule, support is improving, but I don't know if absolutely everything is supported yet. (OTOH, some hardware seems to work better in EFI mode than in BIOS mode.)

One more point: rEFIt is a boot manager. Although it can direct the boot process to a BIOS-mode installation, it won't disable an EFI-mode installation. In fact, it can be used as the first stage in an EFI-only boot process, enabling you to select Linux vs. OS X, both of which boot in EFI mode. (FWIW, rEFIt seems to have been abandoned. I've forked the project as rEFInd.)

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ah, thanks for that info. Does rEFInd currently have anything that rEFIt is missing? Will I need to uninstall rEFIt first? – gregghz Apr 30 '12 at 15:17
Yes, I forked rEFInd specifically to fix bugs and add features, many of which are most useful to Linux users. For instance, rEFInd can boot a Linux kernel with EFI stub loader support and pass it reasonable options. (You'll need either a 3.3.x kernel or an older kernel with EFI stub support back-ported to it, so this specific feature isn't yet useful if you're using stock Ubuntu kernels.) See the rEFInd Web page for more information on its features. – Rod Smith Apr 30 '12 at 21:58

Ubuntu 11.04 (Natty) supports booting from EFI as explained by this Ubuntu community wiki.

"From Ubuntu 11.04 onwards (x86_64 only), the ISO CD supports UEFI booting and the Ubuntu installer will try to setup the bootloader got (U)EFI boot."

However there is a warning:

the installer formats the EFI SYSTEM PARTITION to FAT16 (even if the filesystem is non-empty) and also uses efibootmgr, due to which Intel Macs may fail to boot due to corrupted firmware. This feature is not recommended on Mac models because it can corrupt the firmware. You will need to reflash the firmware to repair it.

On Macs use only the Mac alternate ISO CD

The alternate CD is a text based installer. You will be able to repartition your disk to hold both your MacOS and Ubuntu.

As with all installations - make sure you have a full disk image backup first before repartitioning and installing just in-case the installation fails for whatever reason.

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