OK, so I installed vmlinuz-4.4.0-57-generic into the good image (apt-get install linux-virtual) and the resulted kernel/initrd still show the problem.
So this is squarely a kernel regression.
OK, so I installed vmlinuz- 4.4.0-57- generic into the good image (apt-get install linux-virtual) and the resulted kernel/initrd still show the problem.
So this is squarely a kernel regression.