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Install rEFIt: http://refit.sourceforge.net/doc/c1s1_install.html
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Create a new FAT/DOS partition for the linux install (dual boot setup)
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Download the linux ISO, in this case: http://www.ubuntu.com/download/
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Convert the iso to a bootable img format:
cd ~/Downloads hdiutil convert -format UDRW -o ubuntu-13.10-desktop-amd64.img ubuntu-13.10-desktop-amd64.iso
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Partition your USB stick as 'Free space' using Disk Uility
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Find the name of your USB 'disk' with diskutil:
diskutil list
This will list all mounted disks. The size of the disk should allow you to tell which one is your USB stick. In my case /dev/disk3.
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Copy the new img to your USB stick:
sudo dd if=./ubuntu-13.10-desktop-amd64.img.dmg of=/dev/rdisk3 bs=1m
This will copy the image to the stick. I'm using /dev/rdisk3 instead of /dev/disk3 to use the 'raw' copy mode which should be faster than using the name listed with diskutil.
- Restart the mini with the USB stick plugged in. The USB should show up as a boot option in rEFIt (restarting again might help if it's not).
- Install Ubuntu (or another distro of your choosing) to the empty partition.
- You have may have to restart and select partition tool in the rEFIt boot loader for it to recognize the new partition you created with the linux installer.