Newest 4.4 keal not running after updates?

I was farting around with dpkg on my recently re-installed system, looking for a way to see which packages took up the most space (which had been an issue previously) and discovered the following:

$ dpkg-query -W -f='${Installed-Size}t${Package}n' | sort -nr
158443  linux-image-extra-4.4.0-34-generic
158201  linux-image-extra-4.4.0-31-generic
121492  linux-firmware
109159  firefox
108164  libgl1-mesa-dri
68655   linux-headers-4.4.0-34
68628   linux-headers-4.4.0-31
58638   breeze-icon-theme
54242   linux-image-4.4.0-34-generic
54206   linux-image-4.4.0-31-generic

Excellent! I thought. I've got a new keel image. And thanks to it's new 'no reboot' magic...

$ uname -r
4.4.0-31-generic

Hmmm. That's not right. Shouldn't it be 4.4.0-34?

I was really looking forward to some absurdly long uptimes thanks to "no reboot" keel patching, and am under the impression that the system should be using the latest (-34) version. Is there some additional step I'm overlooking? Might a forthcoming update fix the issue? Or - say it's not so - is there a reboot in my future

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