[server] Garbled text on startup

I'm having an issue with my Ubuntu Server 16.04 installation. I have it running on a Zotac Z-Box CI23 Nano. It installed fine, but on its first boot all I had was a blank screen. I edited

Code:

/etc/default/grub

and changed

Code:

GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"

This let me see the startup, but the text is all garbled white blocks:

I first thought it might be a bad cable, so I switched cables with no change. I changed monitors with no effect. I switched to a TV using HDMI with no effect.

Any ideas would appreciated.

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[server] Garbled text on startup