Be aware, however, that some problem reports such as this one and this one have appeared concerning the rEFIt installer scripts causing corruption of large hard disks those over about MB on Macs.
- Installing Linux on a MacBook without OS X | Lennart Regebro: Python, Plone, Web.
- Navigation menu.
- The rEFIt Project.
- Triple Boot via Boot Camp?
- Preparing OSX (Installing rEFInd).
- Triple Boot via Boot Camp.
Thus, you might want to stick with manual installation of rEFIt even on Macs. It's well-commented and may need no adjustment, particularly on Macs. Although this is convenient, it does have its drawbacks: One problem is that your list of options can grow to ridiculous sizes if you install boot loaders to test them, or if you install EFI programs that aren't boot loaders rEFIt tends to interpret them as if they were boot loaders.
Triple boot Mac, Windows, and Linux, with rEFIt without using Boot Camp
Another problem is that you can't give your boot loaders descriptive names, and sometimes the names are simply wrong—a Linux installation might be labelled as Windows, for example. If you want to boot a Linux kernel with the EFI stub loader support, you can do so; however, rEFIt provides no mechanism to pass options to the kernel. Thus, if the kernel is to find its initial RAM disk and root filesystem, and if it's to use any other kernel options your system might need, you must include the options in the kernel binary itself.
You can do this when you compile the kernel, as described on the EFI stub loader page. You can select your OS by using the arrow keys on the keyboard and pressing Enter, much as you would when using other boot loaders. If you use text mode, of course, the GUI display is replaced by a textual listing of options.
You can sometimes pass special options to a specific boot by pressing the Insert key once it's highlighted. Another such fork exists, too: Clover. I don't dedicate another page to this boot loader because, the last time I checked, Clover adds nothing to rEFIt that helps with booting Linux distributions.
Instead, Clover is intended as a Hackintosh boot loader—that is, it helps users run macOS on non-Apple hardware. Hackintosh configurations are technically violations of Apple's license agreement which requires running the OS on Apple hardware , and so are of dubious legality in many areas. If you decide to use Clover, you can use it to chainload to another Linux boot loader; or you can use another boot manager to chainload to Clover or to your preferred Linux boot loader.
There's little reason to use Clover in most non-Hackintosh environments, though. I don't have extensive notes on how to do this, though. It might also be possible to use Clover to install more recent versions of macOS on older Mac hardware that officially does not support the newest macOS versions. I've never tried this, though, and I can't promise it would work.
In any event, if you need help with Clover, you should probably ask about it on a Hackintosh forum, even if you're not setting it up to run macOS on non-Apple hardware. So I select it, and wait a moment while it brings up Well I'm pretty sure that device is bootable. So why won't it boot? I try Google; there are many hits for this message, and accidentally mistyped versions of it, but everybody who's complaining about it is some recent Windows convert who still thinks they need to run it and has botched an install.
Partition Your Mac
The problem they're having is not that they see this message after selecting an external boot device, but that they see it always, and don't know how to get back to OS X or Windows which isn't even installed correctly anyway. So how does this relate to the problem I'm having? Where is this message coming from, anyway? Several of these people seem to think it's coming from Windows somewhere, but clearly that's not the case for me.
After some more searching I find rEFIt which provides a few clues. Finally, after running several of the diagnostic tools they have to help you set up systems to boot, it dawns on me what's going on.
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Apple's firmware only looks at the internal disk when booting a legacy OS, even if you selected it from an external disk. And I have no legacy OS on the internal disk, so the firmware can't figure out what to do and shows this message.
How to Install and Dual Boot Linux and Mac OS
Remember all those Windows people? The problem they're having is that Boot Camp set the firmware to boot in legacy OS mode automatically, but it did that before Windows was actually installed. If the installation is interrupted before Windows installs its legacy bootloader, then you'll get this message every time you boot unless you hold down option to select the OS X partition. So I have two options here, or maybe three. The one I don't really count is to try booting Linux with EFI, but I already mentioned that I don't really want to do that since I'd like my video card to actually work.
Hey, video card manufacturers! This situation sucks! Release some damn source code or specifications, and the open source community will take care of it for you. I decided to investigate using the internal disk. As luck would have it, Apple's Disk Utility is one of those many partitioning utilities that for some reason or another feels compelled to waste space in the name of aligning partitions on some sort of huge invisible grid on the disk.
MactelSupportTeam/AppleIntelInstallation - Community Help Wiki
It left me MB of unpartitioned space at the end of my internal disk, even though I'd originally told it to use all available space. GRUB's config files also need some updates, which can be done automatically by running sudo update-grub even though I did it by hand the first time. So far, this is all still totally reversible by just deleting the partition. Also reversible, with care.