After updating my system (with whatever was in the 18.04 repositories in recent weeks), VMWare can't update it's kernel modules. I hit Install on the VMWare Kernel Module Updater and it says it's trying to do "vmmon" and "vmnet". But it fails, saying "Unable to install all modules. See log /tmp/vmware-myhostname/vmware-1711.log for details. (Exit code 1)"
Here are the contents of this file: https://pastebin.com/hN6F6895