I've just uploaded this, which may help (will also require a ubiquity upload for desktop; I'll do that a bit later):
grub-installer (1.128ubuntu2) xenial; urgency=medium
* If grub-installer/choose_bootdev only has one non-manual choice, default to that and reduce question priority to low. May fix LP: #1528360.
-- Colin Watson <email address hidden> Mon, 04 Jan 2016 14:06:44 +0000
I've just uploaded this, which may help (will also require a ubiquity upload for desktop; I'll do that a bit later):
grub-installer (1.128ubuntu2) xenial; urgency=medium
* If grub-installer/ choose_ bootdev only has one non-manual choice, default
to that and reduce question priority to low. May fix LP: #1528360.
-- Colin Watson <email address hidden> Mon, 04 Jan 2016 14:06:44 +0000