by Xanayoshi » Thu May 05, 2016 2:04 pm
Using gparted or something else
Create a Swap, with 8 Gb or so, less if you want, but I like to move mine around
Create an Ext4 Root(/), for Ultimate you need around 20, 25gb, much much less with say..Ubuntu or Debian
Create an Ext4 Home(/home), put the rest on it
At installer point to your already made partitions, install grub to the external drive
Boot at Bios or if running Linux, update grub and it will show up on reboot
I have no idea why it has to be this way, this also works on SD/USB etc..