I am following these instructions - http://courses.cms.caltech.edu/cs171...and_Ubuntu.pdf - to create a dual boot on my Mac mini. In Part 2, the instruction call for creating two partitions. One partition is 128mb and will be the future boot loader. When I try to create it, it fails with the following error message - "An internal error has occurred. Operation failed." I have run first aid on the drive and it does not show any errors but every attempt to create the initial partition fails. Does anyone have any insight on the issue or how I can proceed?
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