mac keeps asking for password on startup el capitan

Use an Ubuntu installer (usually a flash drive) to install Ubuntu in the free space.Free space is space that is not part of a partition. Use the macOS diskutil command to shrinking a existing macOS partition to create free space for Ubuntu.

If desired, use the Boot Camp Assistant to install Windows 10.

The typical procedure to install a macOS (OS X) and Ubuntu dual boot is as follows. This conflict can be resolved by having two EFI partitions.

Installing a macOS/Windows/Ubuntu triple boot on your Mac does create a conflict in that both Ubuntu and Windows both install a file in the original EFI partition at /EFI/Boot/boot圆4.efi. According to Rod Smith (the current maintainer of the rEFInd Boot Manager), this file then transfers execution to the /EFI/ubuntu/grub64.efi file (GRUB), which can be used to boot Ubuntu. When the BOOX64.EFI file executes, the software changes the EFI settings to make Ubuntu the default operating system to boot. This file is an exact copy of the /EFI/ubuntu/shim圆4.efi file stored in the same volume. (You hold down the option key at startup to access to the Mac Startup Manager.) The Startup Manager instructions the boot loader in the firmware to boot using the file /EFI/BOOT/BOOX64.EFI file in the FAT32 formatted volume in the EFI partition. I will post my successful attempts below.īy default, Ubuntu can be accessed from the Mac Startup Manager by selecting the icon labeled EFI Boot. The ultimate goal : having a trial-boot by adding Windows on BootCamp. If I want to switch to Ubuntu, I'd like to select it from the boot menu. In other words : when I power on my Mac, I want my default OS to be MacOS.

Formatting the hard drive to make it Mac-compatible (HFS, HFS+) via Ubuntu (through GParted for instance) is far from easy because the Mac packages aren't available: you have to search & install them.īasically I'm trying to have a dual-boot system (MacOS & Ubuntu) without affecting my EFI settings.

If you delete the EFI settings (= EFI partition on your hard drive), your device cannot boot on this OS and often leads to a black screen or equivalent at startup. *The EFI settings are - simply put - what allows your device to boot on a given OS.

When installing Ubuntu through a USB flashdrive via the mac boot menu, the Ubuntu installer has this annoying habit of replacing the original Mac EFI settings* with Ubuntu EFI settings*.

Initially, I was aiming at dual-booting MacOS and Ubuntu on a Macbook Pro, which worked after few attempts but it had its major flaws :

I encountered this issue quite often and tested a few solutions so I hope this will help.

Mac keeps asking for password on startup el capitan