Comment 8 for bug 1477455

I see the change here:
http://launchpadlibrarian.net/337696593/update-manager_1%3A17.10.9_1%3A17.10.10.diff.gz
As for /boot, the instruction for freeing space is to use 'sudo apt autoremove'. But that just might not work due to broken dependencies or Bug #1678187. On the other hand, it might remove more packages than desired according to https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1624644/comments/11
Anyway, I think
sudo apt-get install --fix-broken --auto-remove linux-generic
might work better than
sudo apt autoremove
or
sudo apt-get install --fix-broken,
if linux-generic is the package that has broken dependencies (which is the most common case).