Re: Ubuntu 18.04 kernel 4.15.0-106-generic breaks wireguard-1.0.20200520

[Ada Sauce]

I'm now also observing the same failure mode as Martin.

However, the kernel is 4.15.0-101-generic.

```
/var/lib/dkms/wireguard/1.0.20200611/build/socket.c: In function ‘send6’:
/var/lib/dkms/wireguard/1.0.20200611/build/socket.c:139:20: error: ‘const struct ipv6_stub’ has no member named ‘ipv6_dst_lookup_flow’; did you mean ‘ipv6_dst_lookup’?
   dst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(sock), sock, &fl,
                    ^~~~~~~~~~~~~~~~~~~~
                    ipv6_dst_lookup
scripts/Makefile.build:330: recipe for target '/var/lib/dkms/wireguard/1.0.20200611/build/socket.o' failed
make[1]: *** [/var/lib/dkms/wireguard/1.0.20200611/build/socket.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:1577: recipe for target '_module_/var/lib/dkms/wireguard/1.0.20200611/build' failed
make: *** [_module_/var/lib/dkms/wireguard/1.0.20200611/build] Error 2
make: Leaving directory '/usr/src/linux-headers-4.15.0-101-generic'
```

Cheers, Ada