Ubuntu 18.04 systemd-udevd uses high CPU, conflict with nvidia graphics

I solved this problem by running

sudo mv /lib/udev/rules.d/71-nvidia.rules ~

and rebooting, so that udev doesn't try to load the nvidia module.

So far, so good, though I suspect this has probably done something to the graphics that I won't be aware of.

Workaround

Soon after booting, run the following commands:

sudo systemctl stop systemd-udevd systemd-udevd-kernel.socket systemd-udevd-control.socket

sudo systemctl start systemd-udevd systemd-udevd-kernel.socket systemd-udevd-control.socket

It worked in my Dell laptop, and all the problems are gone.