Some extra information, courtesy of a twitter friend:
https://twitter.com/hikari_no_yume/status/951651425297330176
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https://bugs.launchpad.net/bugs/1742829
Title:
Windows dynamic disks
Public bug reported:
This is with the previous 18.04 daily image (I think it was dated last
week, but I don't currently have access to the ISO I downloaded).
The system seems to recognize Windows dynamic disks as swap space, and
during the installation it tries to format it. For me, this resulted
