Package: xl2tpd Version: 1.3.11-1 Kernels 4.15 and 4.16 break xl2tpd, please see following upstream issue for more details : https://github.com/xelerance/xl2tpd/issues/147
The following commit/patch fixes the issue: https://github.com/xelerance/xl2tpd/commit/9c2cd4933478a83075df5b10f24af7589e90abc3.patch It'll be great if the patch could be backported or new package created whenever the next xl2tpd non-dev release is made on github.
