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i wanted to try ubuntu, and made a bootable Memory stick and the ubuntu installer and try ubuntu works just fine. But now ubuntu or something overrides my macs boot menu and I do not know how to get back to my mac os.

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  • Try running sudo update-grub from a terminal in Ubuntu and then reboot. You may have to hold down the Shift key for GRUB's menu to appear.
    – s3lph
    Apr 23, 2015 at 12:51

1 Answer 1

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When your Mac boots up, hold down the Option key. This will enter the Mac's BIOS boot menu and you can choose your Macintosh HD from here.

EDIT:
Try this instead:
Open a terminal in Ubuntu and run sudo update-grub. Hopefully, this will add Mac OS to your GRUB menu and you'll be able to boot. If it doesn't, you most liekly chose to erase your disk and install Ubuntu, which means OS X is gone.

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  • No it doesnt work, the mac bootup sound does not plays either. It just skips right to the ubuntu install
    – Theodor
    Apr 23, 2015 at 12:48
  • You pressed the option key right as the computer turns on? Apr 23, 2015 at 12:49
  • Yes, starting macosx in safe mode does not work either
    – Theodor
    Apr 23, 2015 at 12:50
  • OK. I'll edit my answer with a new option. Apr 23, 2015 at 12:50
  • Can I install mac os after installing ubuntu again?
    – Theodor
    Apr 23, 2015 at 12:55

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