Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer can't see your disk, or it says that it can't install on your computer or volume, you may need to erase your disk first.If the installer offers the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions.When you see a window with the option to reinstall macOS, this means your Mac has started up from Recovery. Then click Next and enter that user’s administrator password, which is the password they use to log in to the Mac. If you’re asked to select a user you know the password for, select the appropriate user.To select a Wi-Fi network, use the Wi-Fi menu in the top right-hand corner of the screen. You may be asked to select a Wi-Fi network or attach a network cable.Keep holding the keys until you see an Apple logo or spinning globe.Shift-Option-Command-R: when you press and hold these four keys during the startup process, macOS Recovery may offer the macOS that came with your Mac, or the closest version still available.Option-Command-R: when you press and hold these three keys during the startup process, macOS Recovery may offer the latest macOS that is compatible with your Mac.Command-R: when you press and hold these two keys during the startup process, macOS Recovery will offer the current version of the most recently installed macOS.If none of them work, review the guidelines for using startup key combinations. Immediately after releasing the power button, press and hold one of these key combinations.Press and release the power button to turn on your Mac.In my particular case, the OS-X partition was still bootable if I held the Option key during startup and selected the "Macintosh HD".Īfter booting OS-X you'll want to open System Preferences, and then go to Startup Disk.If you're not using a Mac with Apple silicon, you're using an Intel-based Mac. Because of the confusion, and the fact that the boot loader is installed to a different place depending on which mod you are booted in, the grub updater makes a big mistake and installs grub in MBR mode to the internal HDD. Now at this point I don't know exactly what happened, but here's my best guess: The grub updater got confused since grub was installed in MBR mode, but Ubuntu was currently booted in UEFI mode. Looking at logs, it seems that the update-grub command was run during the install process. So then I let the Software Updater run some updates. That fact is very important, and you'll see why in just a second. What that means is because rEFInd is, well, EFI obviously, and it functions essentially as a GRUB replacement, that even though Ubuntu was installed in MBR mode to the external HDD, it ended up being booted in UEFI mode. Instead, it was the scrolling white text boot up.įrom what I can tell looking at rEFInd more closely before hitting boot is that the Ubuntu option was actually to load a specific kernel, and not just boot from the disk. After telling rEFInd to boot from the external HDD, the purple GRUB screen never came up (Yes, I had set a delay) and furthermore, there was no purple dot boot animation. This is where things start to go really strange. After booting from that DVD, I then selected my external HDD to boot from inside of rEFInd. (Selecting "EFI boot" with the DVD icon when holding the Option key during startup). Now in order to boot Ubuntu from my external HDD, I first booted from a DVD that I had burned an ISO of rEFInd to. That value is controlled by your selection in "System Preferences > Startup Disk". Apparently, there is an NVRAM value that tells the firmware whether to attempt to boot in UEFI mode (OS-X) or in legacy MBR mode (Windows). In order to maintain compatibility with MS-Windows, Apple uses a hybrid UEFI and Legacy MBR mode. So things were even more complicated than it seemed at first.
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