Simply move /Library/StartupItems/VirtualBox (directory) out of the StartupItems, do the boot cycle, and put it back later. If you have Oracle's VirtualBox installed in OS X, it will prevent that boot cycle from succeeding.

You don't need to even login to OS X, just click shutdown and the next boot screen should be rEFInd. NOTE: rEFInd requires one clean boot cycle to properly install. On some of the Mac hardware a special WiFi driver is needed (see below), so best download the zip file beforehand. Therefore it is necessary to install rEFInd after installing Linux. openSUSE Leap 42.3 and 15.0 overwrite the default EFI boot manager, leaving impossible to load MacOS. It is installed into one of the disk's partitions, the choice of which is up to you after being exposed to the options the rEFInd installation instructions offer. REFInd manages the EFI based boot process. In OS X run the Software Update tool to check for OS and Firmware updates. If you intend to install only openSUSE, you can skip all the Preparation steps. It is recommended that you keep OS X even if you don't intend to use it, as this will allow you to install any firmware updates that Apple releases. You can choose to install only openSUSE, multi-boot OS X and openSUSE, or OS X, Windows and openSUSE. Remember to always back-up your data first! This chapter describes the steps you should do before you install openSUSE on your Mac. 4 Multi-Booting With Windows (pre 2012).1.5 Making a bootable USB pen drive on MacOS.

1.3.3 Using diskutil in OS X 10.4.6 or later (pre 2012).

1.3.2 Using BootCamp in OS X 10.5 Leopard or OS X 10.6 Snow Leopard (pre 2012).

1.3.1 Using Disk Utility in OS X 10.5 Leopard or OS X 10.6 Snow Leopard (pre 2012).

Arch linux macbook air 2017 install