I got a workaround by removing /lib/udev/rules.d/97-hid2hci.rules as was
mentioned in a comment at
https://askubuntu.com/questions/1028883/ubuntu-18-04-systemd-udevd-uses-
high-cpu-conflict-with-wifi
It seems to be some rule for Bluetooth and touchpads. My touchpad still works,
Bluetooth
Public bug reported:
It first appeared when I upgraded ubuntu studio to 18.04
udevd started to use all available cpu.
now I'm running ubuntu desktop from a usb key and it's still the same
udevadm monitor returns:
KERNEL[2512.539491] unbind
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