Yes, I am testing a second 16.04 Xenial Xerus installation using a USB wifi adapter and the "Download updates while installing Ubuntu Studio" box is greyed out. I noticed as the DVD was booting there were 3 black screen level errors which cleared (displayed again then "went away") at the first power down. I didn't have the quick reflexes to take a photo of the error messages, and I don't want to start digging around for a log somewhere, but it may be related...
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