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I'm using an iMac

Using ubuntu, I made a bootable gparted usb (via unetbootin) to partition my hard drive. I reduced the size of my ubuntu partition and added two hfs+ primary partitions.

Now, even after removing the two other partitions, and making the ubuntu partition bigger, it won't boot. If I press alt, the hd doesn't even show up

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Make sure that the boot flag is set for the partition where your boot-loader is installed.

Also take a look at this GPartEd tutorial. You'll find a lot of best practice advice.

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