Images are to be supported for as long as possible. Installing Hardware Enablement stack by Ubuntu will align 14.04 Trusty installations with basic packages from 16.04 Xential.
Based on instructions here:
apt-get install --install-recommends linux-generic-lts-xenial xserver-xorg-core-lts-xenial xserver-xorg-lts-xenial xserver-xorg-video-all-lts-xenial xserver-xorg-input-all-lts-xenial libwayland-egl1-mesa-lts-xenial