Comment 25 for bug 1629870

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Vaclav Rehak (vaclav-n) wrote : Re: Trouble installing mainline kernel 4.8: virtualbox-dkms 5.0.24-dfsg-0ubuntu1.16.04.1: virtualbox kernel module failed to build

To install the new kernel on xenial, enable Pre-release updates (xenial-proposed) in System Settings - Software & Updates - Developer Options and run
sudo apt-get install linux-generic-hwe-16.04-edge

After reboot you'll probably get this error.