Doing 1 and 2 together is vital imo, Not so sure about the difference between 4 a and 4 b. Is it just the kernel?
FYI, there seems to be an issue with ubuntu 16.04 and 4.4 kernels on some machines. I updated a few of mine yesterday. Most went well, but one surprised me that is even boots now. It shows 7 kernels, states they are only half unpacked and will not allow update, install and freezes every 5 minutes. Fatal error is mention more than I can count, when I try auto remove or even remove them manually. When I google the error, found I was not alone. Not sure if it is driver or hardware related, but changed drivers and it did not help. For that machine, I am backing up and will re-install, then lock the kernel.
FYI, there seems to be an issue with ubuntu 16.04 and 4.4 kernels on some machines. I updated a few of mine yesterday. Most went well, but one surprised me that is even boots now. It shows 7 kernels, states they are only half unpacked and will not allow update, install and freezes every 5 minutes. Fatal error is mention more than I can count, when I try auto remove or even remove them manually. When I google the error, found I was not alone. Not sure if it is driver or hardware related, but changed drivers and it did not help. For that machine, I am backing up and will re-install, then lock the kernel.