Comment 0 for bug 1636838

[Impact]

 * Unable to boot into system after upgrade to 4.4.0-1030.37

[Test Case]

 * fresh install ubuntu-16.04.1-preinstalled-server-armhf+raspi2.img.xz

 * enable -proposed and 'apt full-upgrade'

[Regression Potential]

 * red led still on, but few green led blinks then stay at the black screen(hdmi on)

[Other Info]

 * restore the working boot partition backup image could recover the situation