Looks like I have the same issue. It seems that the wireguard dkms module breaks with a recent kernel patch. I booted into the last working kernel to get the module working again. ---- Wireguard module missing for 5.3.0-40-generic: sudo dkms status virtualbox, 6.0.14, 5.3.0-26-generic, x86_64: installed virtualbox, 6.0.14, 5.3.0-29-generic, x86_64: installed virtualbox, 6.0.14, 5.3.0-40-generic, x86_64: installed wireguard, 0.0.20190913, 5.3.0-26-generic, x86_64: installed wireguard, 0.0.20190913, 5.3.0-29-generic, x86_64: installed ---- Building fails: sudo dkms build wireguard/0.0.20190913 -k 5.3.0-40-generic Kernel preparation unnecessary for this kernel. Skipping... Building module: cleaning build area... make -j4 KERNELRELEASE=5.3.0-40-generic -C /lib/modules/5.3.0-40-generic/build M=/var/lib/dkms/wireguard/0.0.20190913/build...(bad exit status: 2) ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/wireguard-dkms.0.crash' Error! Bad return status for module build on kernel: 5.3.0-40-generic (x86_64) Consult /var/lib/dkms/wireguard/0.0.20190913/build/make.log for more information. ---- Build log: cat /var/lib/dkms/wireguard/0.0.20190913/build/make.log DKMS make.log for wireguard-0.0.20190913 for kernel 5.3.0-40-generic (x86_64) wo 19 feb 2020 20:43:32 CET make: Entering directory '/usr/src/linux-headers-5.3.0-40-generic' 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:1655: _module_/var/lib/dkms/wireguard/0.0.20190913/build] Error 2 make: Leaving directory '/usr/src/linux-headers-5.3.0-40-generic'