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1. #HOW TO REFORMAT MACBOOK PRO OSX CAPITAN INSTALL#
2. #HOW TO REFORMAT MACBOOK PRO OSX CAPITAN UPDATE#

I was able to reboot into OSX by using the "Select Disk." under the Apple menu in the Installer app when I see the error to choose my hard disk, but it boots back into Yosemite. I've tried power cycling just to be sure, and I used Option at boot and selected the HD (I only get two options: the HD and the recovery partition). I do that, and it reboots into the installer again (does not offer rEFInd anymore so I can't boot Linux) and does the exact same thing. A sheet will drop down asking you if you really meant to agree to the terms. Read through the terms and conditions, and then click the Agree button. The El Capitan license agreement will display.

#HOW TO REFORMAT MACBOOK PRO OSX CAPITAN INSTALL#

It suggests that I "Quit the installer to restart your coputer and try again." How do I clean install OS X Perform the Clean Install of OS X El Capitan In the Install OS X window, click the Continue button.

#HOW TO REFORMAT MACBOOK PRO OSX CAPITAN UPDATE#

I downloaded the update using the normal OSX App Store and started the install, but when it rebooted I get a failure in the OSX Installer, saying "OS X could not be installed on your computer", with a reason that "A boot helper partition is required when working with Core Storage". I need to update to El Capitan because, in the few times I need to use OSX, I need a newer version of Xcode which Apple, in its infinite wisdom, won't allow you to install on an older version of OSX. I have a Macbook Pro 9,2 which was until today happily running Yosemite, and using rEFInd 0.10.3, and dual-booting Ubuntu GNOME 16.04 LTS.