Comment 60 for bug 1357093

In 16.04, unattended-upgrades installed kernel linux-image-4.4.0-31-generic. Now /etc/apt/apt.conf.d/01autoremove-kernels protects releases 4.4.0-28-generic and 4.4.0-31-generic, but unattended upgrades did not purge two older kernels there are in my system. All of the kernels are automatically installed. I suppose unattended-upgrades should purge extra kernels right after it installs new one.