All, I use vitrualbox-bin (AUR) along with ext-oracle extension pack referenced in https://wiki.archlinux.org/index.php/VirtualBox#Extension_pack. I have followed the addition of the guest-addition kernel modules to the 4.15 kernel, but I do not know how to handle that addition regarding what changes are needed in my arch guests. Specifically, since the guest additions are included in 4.15, but not in LTS, how do I disable the load the guest additions modules when booting the VM on 4.15, but not when booting LTS? Currently on boot with 4.15, errors are generated when vboxadd attempts to load the guest addition modules since, presumably, they are already in the kernel, e.g. 22:23 vl1:~> sc status vboxadd-service ● vboxadd-service.service Loaded: loaded (/opt/VBoxGuestAdditions-5.2.6/init/vboxadd-service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Fri 2018-02-09 22:16:33 CST; 7min ago Process: 1056 ExecStart=/opt/VBoxGuestAdditions-5.2.6/init/vboxadd-service start (code=exited, status=1/FAILURE) Feb 09 22:16:33 vl1 systemd[1]: Starting vboxadd-service.service... Feb 09 22:16:33 vl1 vboxadd-service[1056]: vboxadd-service.sh: Starting VirtualBox Guest Addition service. Feb 09 22:16:33 vl1 vboxadd-service.sh[1059]: Starting VirtualBox Guest Addition service. Feb 09 22:16:33 vl1 vboxadd-service[1056]: VirtualBox Additions module not loaded! Feb 09 22:16:33 vl1 systemd[1]: vboxadd-service.service: Control process exited, code=exited status=1 Feb 09 22:16:33 vl1 systemd[1]: vboxadd-service.service: Failed with result 'exit-code'. Feb 09 22:16:33 vl1 systemd[1]: Failed to start vboxadd-service.service. 22:24 vl1:~> sc status vboxadd ● vboxadd.service Loaded: loaded (/opt/VBoxGuestAdditions-5.2.6/init/vboxadd; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Fri 2018-02-09 22:16:33 CST; 7min ago Process: 288 ExecStart=/opt/VBoxGuestAdditions-5.2.6/init/vboxadd start (code=exited, status=1/FAILURE) Main PID: 288 (code=exited, status=1/FAILURE) Feb 09 22:16:23 vl1 vboxadd[288]: VirtualBox Guest Additions: Building the VirtualBox Guest Additions kernel modules. Feb 09 22:16:33 vl1 vboxadd[288]: VirtualBox Guest Additions: Look at /var/log/vboxadd-setup.log to find out what went w Feb 09 22:16:33 vl1 useradd[1042]: failed adding user 'vboxadd', data deleted Feb 09 22:16:33 vl1 useradd[1043]: failed adding user 'vboxadd', data deleted Feb 09 22:16:33 vl1 vboxadd[288]: groupadd: group 'vboxadd' already exists Feb 09 22:16:33 vl1 vboxadd[288]: modprobe vboxguest failed Feb 09 22:16:33 vl1 vboxadd[288]: The log file /var/log/vboxadd-setup.log may contain further information. Feb 09 22:16:33 vl1 systemd[1]: vboxadd.service: Main process exited, code=exited, status=1/FAILURE Feb 09 22:16:33 vl1 systemd[1]: vboxadd.service: Failed with result 'exit-code'. Feb 09 22:16:33 vl1 systemd[1]: Failed to start vboxadd.service. The guest additions in the 4.15 kernel work fine, so my first thought was to disable both vboxadd.service and vboxadd-service.service, but then what do I do for LTS? I've checked the wiki and there are no notes related to handling this issue. Any suggestions? -- David C. Rankin, J.D.,P.E.