This is related to bug #759545 and bug #1009294. 759545 is about a spurious prompt when /etc/default/grub is unmodified; that bug is probably fixed now and should be closed. Bug #1009294 is about a spurious prompt on cloud images because ucf's cache doesn't reflect the debconf settings used for /etc/default/grub within the image.
Because of this bug, however, the cloud images will continue to carry a delta to /etc/default/grub relative to what's in the grub2 package, and therefore any time there *is* a change to the template, users will continue to get a ucf prompt.
So a solution needs to be found that lets the cloud images override settings without triggering ucf pain.
This is related to bug #759545 and bug #1009294. 759545 is about a spurious prompt when /etc/default/grub is unmodified; that bug is probably fixed now and should be closed. Bug #1009294 is about a spurious prompt on cloud images because ucf's cache doesn't reflect the debconf settings used for /etc/default/grub within the image.
Because of this bug, however, the cloud images will continue to carry a delta to /etc/default/grub relative to what's in the grub2 package, and therefore any time there *is* a change to the template, users will continue to get a ucf prompt.
So a solution needs to be found that lets the cloud images override settings without triggering ucf pain.