Comment 21 for bug 1653636

I expect I got the kernel the same way I get most of my kernels, though an `apt-get upgrade`. Although I did try and compile a kernel a while ago... I wonder if that got left around as an install option and it was so long since I last rebooted I forgot about it!

Now isn't that a silly thing to do. I will reboot into 4.4.0-57 and apply updates. Then probably remove the upstream kernel or at least try updating it and seeing if it boots then remove it.