Removing left over kernel packages from previous kernel after hwe upgrade
Solution 1:
You can install the 4.8 linux-tools by
sudo apt install linux-tools-generic-hwe-16.04 linux-tools-virtual-hwe-16.04
The linux-libc-dev should stay this version. It is not upgraded in 16.04.2.
That will install linux-tools packages that should match the running kernel version.
Also you can remove linux-image, linux-headers and linux-tools packages of the 4.4 version using e.g. synaptic if you are sure you won't use those kernels.