Wireguard is broken by recent ubuntu 18.04 kernel update

[Vasili Pupkin]

The system is Ubuntu 18.04.4, and wireguard is broken in recent kernel 
update "5.3.0-53.47~18.04.1"... not sure why 18.04.1 is landed on 
18.04.4 system

# ip link add dev wg0 type wireguard
Error: Unknown device type.

And nothing is shown by "lsmod | grep wireguard' and "dmesg | grep 
wireguard"

I've tried "apt install --reinstall wireguard" and "update-initramfs -u 
-k all" with no luck.

Everything works fine with kernel 5.3.0-51