Module is not signed, so udev refuses to load without extra steps

[NeoCortex97]

I am running Ubuntu 20.04 with kernel 5.13.0-28-generic. If I insert the usb device I get the following log message,

[  608.093375] Lockdown: systemd-udevd: unsigned module loading is restricted; see man kernel_lockdown.7

I am using a "Dootoper AC 1200 Dual-Band USB 3.0 Adapter" with a Realtek 8812bu ic.
Otherwise everything worked.