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Excerpts from Gregory Haynes's message of 2016-06-20 17:24:28 -0500:
> On Mon, Jun 20, 2016, at 03:52 PM, Jay Pipes wrote:
> > Hi dib-gurus,
> > 
> > I'm trying to build a simple ubuntu VM image on a local Gigabyte BRIX 
> > with a AMD A8-5557M APU with Ubuntu 16.04 installed and getting an odd 
> > error. Hoping someone has some ideas...
> > 
> > The command I am running is:
> > 
> > disk-image-create -o /tmp/ubuntu.qcow2 --image-size=10 ubuntu vm
> > 
> > Everything goes smoothly until trying to write the MBR, at which point I 
> > get the following error:
> > 
> > + /usr/sbin/grub-install '--modules=biosdisk part_msdos' 
> > --target=i386-pc /dev/loop0
> > Installing for i386-pc platform.
> > /usr/sbin/grub-install: warning: this msdos-style partition label has no 
> > post-MBR gap; embedding won't be possible.
> > /usr/sbin/grub-install: error: embedding is not possible, but this is 
> > required for cross-disk install.
> > /dev/loop0: [0047]:3 (/tmp/image.hk8wiFJe/image.raw)
> > 
> > Anybody got any ideas?
> > 
> > Thanks in advance!
> > -jay
> 
> Hey Jay,
> 
> I just tried to reproduce this on my 14.04 box and wasn't able to so I
> am betting there's some kind of new bug with us on 16.04. Do you get the
> same error if you run without --image-size=10? Last time we had an issue
> like this a new grub version changed the default behavior, so I'd
> suspect something along those lines.
> 
> I am trying out a new run on a 16.04 box but its going to be a bit
> before the cloud image downloads (cloud-image.ubuntu.com is pretty
> slow)...

I just completed a run on 16.04, so it's not that.

I wonder if it might be sensitive to disk geometry accidentally.