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Stuck on mkfs.ext4

The instructions on this page don't work for me. Whether I pick a fixed size or dynamically expanding VDHX drive, the installation is stuck indefinitely at mkfs.ext4. I'm using the 08/2016 ISO on Windows 8.1. All I found was some vague Ubuntu thread: [1] -- Alad (talk) 15:21, 21 August 2016 (UTC)