I built WireGuard from source, and I got "Module verification failed" message when I tried to run "wg-quick up".

Here is what I found in dmesg:

[   55.700967] wireguard: module verification failed: signature and/or required key missing - tainting kernel

[   55.701390] wireguard: WireGuard 0.0.20170810 loaded. See www.wireguard.com for information.

[   55.701391] wireguard: Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.

ffs@server:~$ uname -a

Linux server 4.4.0-93-generic #116-Ubuntu SMP Fri Aug 11 21:17:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Thanks!