Comment 8 for bug 1856539

This is what I see in `/var/crash/wireguard-dkms.0.crash`:

```
ProblemType: Package
DKMSBuildLog:
 DKMS make.log for wireguard-0.0.20190913 for kernel 5.3.0-1018-raspi2 (aarch64)
 Tue Feb 18 20:52:38 UTC 2020
 make: Entering directory '/usr/src/linux-headers-5.3.0-1018-raspi2'
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/main.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/noise.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/device.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/peer.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/timers.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/queueing.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/send.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/receive.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/socket.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/peerlookup.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/allowedips.o
   CC [M] /var/lib/dkms/wireguard/0.0.20190913/build/ratelimiter.o
 /var/lib/dkms/wireguard/0.0.20190913/build/socket.c: In function ‘send6’:
 /var/lib/dkms/wireguard/0.0.20190913/build/socket.c:145:20: error: ‘const struct ipv6_stub’ has no member named ‘ipv6_dst_lookup’; did you mean ‘ipv6_dst_lookup_flow’?
   145 | ret = ipv6_stub->ipv6_dst_lookup(sock_net(sock), sock, &dst,
       | ^~~~~~~~~~~~~~~
       | ipv6_dst_lookup_flow
 make[1]: *** [scripts/Makefile.build:290: /var/lib/dkms/wireguard/0.0.20190913/build/socket.o] Error 1
 make[1]: *** Waiting for unfinished jobs....
 make: *** [Makefile:1658: _module_/var/lib/dkms/wireguard/0.0.20190913/build] Error 2
 make: Leaving directory '/usr/src/linux-headers-5.3.0-1018-raspi2'
DKMSKernelVersion: 5.3.0-1018-raspi2
Date: Tue Feb 18 20:52:52 2020
DuplicateSignature: dkms:wireguard-dkms:0.0.20190913-1ubuntu1:/var/lib/dkms/wireguard/0.0.20190913/build/socket.c:145:20: error: ‘const struct ipv6_stub’ has no member named ‘ipv6_dst_lookup’; did you mean ‘ipv6_dst_lookup_flow’?
Package: wireguard-dkms 0.0.20190913-1ubuntu1
PackageVersion: 0.0.20190913-1ubuntu1
SourcePackage: wireguard
Title: wireguard-dkms 0.0.20190913-1ubuntu1: wireguard kernel module failed to build
```