When installing on a gpt hard drive where there is already one or more OSX partition formatted as hfs+ the installer will crash after the format stage with an "unknown error". It looks like the error is that it is unable to find the hfsplus-tools package. My installation does not touch the hfs+ partitions and so obviously does not use or need the hfsplus tools to proceed.<br />
When I deleted those partitions but kept everything else the same, the install progressed as expected.
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