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Thread: reinstall macos after ubuntu

  1. #1
    Join Date
    Sep 2006
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    9

    reinstall macos after ubuntu

    Not really a ubuntu question, sorry, but I was hoping someone here could help me.

    I have a macbook pro retina 13'' 2015 and have ubuntu installed. Now my daughter has inherited the machine, and she greatly prefers the original MacOS. I'd like to reinstall MacOS Big Sur.

    AFAIU I should create a bootable big sur usb, and also (perhaps using that) reformat my harddrive to APFS (apple's file system) (and rename the disk to Macintosh HD). I think gparted can do macos file system extended but not APFS.

    Can anyone help me direct me how I can go about this? I do have access to a mac with macos installed if that is helpful.

    Thanks!

  2. #2
    Join Date
    May 2006
    Location
    Switzerland
    Beans
    2,905
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: reinstall macos after ubuntu

    Just boot with MacOS Big Sur and let it handle all the disks. If the installer doesn't recognise any usable harddrive / SSD then launch the "Disk Utility" (from MacOS's installer screen) and let it erase the harddrive. The installer should definitely be able to recognise the harddrive / SSD after that.

  3. #3
    Join Date
    May 2006
    Location
    Switzerland
    Beans
    2,905
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: reinstall macos after ubuntu

    Quote Originally Posted by mkborregaard View Post
    I do have access to a mac with macos installed if that is helpful.
    As for the "boot with MacOS Big Sur" part I mentioned in my previous post: You will need to create a bootable USB stick for your other Mac.

    https://9to5mac.com/2020/09/03/how-t...l-drive-video/

  4. #4
    Join Date
    Sep 2006
    Beans
    9

    Re: reinstall macos after ubuntu

    Thanks a lot Scorp123, it does sound very promising, and I was able to generate the big sur installer usb by following the instructions in the link you provided.
    However, I don't seem to be able to boot from it. On a Mac you would normally hold down "Option" under startup to enter the boot menu, but no matter what I press during startup it just enters into the ubuntu install. How would I boot into the USB?

    (Just an additional consideration, which may not be important but may be: When this machine had MacOS installed, the keyboard and trackpad didn't work, and I only used it with an external keyboard and mouse. After installing Ubuntu on the machine, it magically started working! So if you are supposed to have it enter the boot menu by pressing Option even with ubuntu installed, I wonder if maybe the MacOS and BIOS use a different keyboard listening protocol and so the mac bios simply just doesn't register the keystrokes. Just a thought I'd mention.)

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