I plan on rebooting all of the Linux based machines tonight just after midnight in order to load a newer kernel.  Since we’ve been on Ubuntu 18.04 these have gone mostly smooth with the exception of some shell servers not remounting file systems correctly.  I will check these immediately after reboot.  Services should be interrupted for about five minutes each with the exception of those shell servers that do not properly remount.  It takes about an hour to check them all.