on bionic, stopping udevd and starting it again correct the problem:
sudo systemctl stop systemd-udevd systemd-udevd-control.socket systemd-udevd-kernel.socket sudo systemctl start systemd-udevd systemd-udevd-control.socket systemd-udevd-kernel.socket
on bionic, stopping udevd and starting it again correct the problem:
sudo systemctl stop systemd-udevd systemd- udevd-control. socket systemd- udevd-kernel. socket udevd-control. socket systemd- udevd-kernel. socket
sudo systemctl start systemd-udevd systemd-