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→Make a Portable UBUNTU installation
#IN OSX: attach your new portable drive, partition it as an OSX Extended Journaled drive.
#Reboot into the live ubuntu usb disk.
#IN UBUNTU: start install. select "something else", create three partitions (boot, root, and swap), leaving existing EFI partition from OSX.
#Install Refind to first partition.
==Install rEFInd to partition of external drive==