Comment 34 for bug 1675079

Forgive me if this has been asked and answered, but I was pointed here by bug #1675079 which has affected my Ubuntu 16.04 LTS server for a very long time. I have tried time and again to understand how to fix the problem, and I can't figure it out. I see the bug is marked as fixed, and there are several comments with commands pasted, but I can't figure out which command(s) to run to clear the unused images off of /boot. Please help me.