~# systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
● clamav-daemon.service loaded failed failed Clam AntiVirus userspace daemon
● systemd-modules-load.service loaded failed failed Load Kernel Modules
● virtualbox.service loaded failed failed LSB: VirtualBox Linux kernel module
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
3 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
so systemd-modules-load was loaded but failed
~# systemctl status systemd-modules-load
● systemd-modules-load.service - Load Kernel Modules
Loaded: loaded (/lib/systemd/system/systemd-modules-load.service; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2018-12-24 20:28:29 GMT; 2min 46s ago
Docs: man:systemd-modules-load.service(8)
man:modules-load.d(5)
Process: 702 ExecStart=/lib/systemd/systemd-modules-load (code=exited, status=1/FAILURE)
Main PID: 702 (code=exited, status=1/FAILURE)
Dec 24 20:28:29 westfield systemd-modules-load[702]: modprobe: ERROR: could not insert 'nvidia': Operation not permitted
Dec 24 20:28:29 westfield systemd-modules-load[702]: modprobe: FATAL: Module nvidia-current-modeset not found in directory /lib/modules/4.20.0-towo.1-siduction-amd64
Dec 24 20:28:29 westfield systemd-modules-load[702]: modprobe: ERROR: ../libkmod/libkmod-module.c:979 command_do() Error running install command for nvidia_modeset
Dec 24 20:28:29 westfield systemd-modules-load[702]: modprobe: ERROR: could not insert 'nvidia_modeset': Operation not permitted
Dec 24 20:28:29 westfield systemd-modules-load[702]: modprobe: FATAL: Module nvidia-current-drm not found in directory /lib/modules/4.20.0-towo.1-siduction-amd64
Dec 24 20:28:29 westfield systemd-modules-load[702]: Error running install command for nvidia_drm
Dec 24 20:28:29 westfield systemd-modules-load[702]: Failed to insert 'nvidia_drm': Operation not permitted
Dec 24 20:28:29 westfield systemd[1]: systemd-modules-load.service: Main process exited, code=exited, status=1/FAILURE
Dec 24 20:28:29 westfield systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'.
Dec 24 20:28:29 westfield systemd[1]: Failed to start Load Kernel Modules.
And the modules are indeed missing. So I'm presuming that nvidia hasn't yet caught up with kernal 4.20.0
It's a long time since I needed the advantages of the nvidia kernel so, for me, it's been easily solved by going "back" to nouveau.
ps please excuse any typos as I'm a little drunk. Happy Xmas all.