but I note from Slashdot https://linux.slashdot.org/story/17/02/09/006243/linux-kernel-318-reaches-end-of-life the following is included:...Over my head...
... and I wonder if you are in that category or that legacy hardware and drivers issues necessitate your sticking with that version?...Of course, this being the last maintenance update in the series, you are urged to move to a newer LTS branch, such as Linux kernel 4.9 or 4.4, which are far more secure and efficient than Linux 3.18 was. But Linux 3.18 appears to be used by Google and other vendors on a bunch of Android-powered devices, and even some Chromebooks use Linux kernel 3.18 on Chrome OS,...