Comment 0 for bug 1760796

Kernel 4.15 breaks 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

As Ubuntu 18.04 (Bionic Beaver) is no longer accepting Debian packages, I'm guessing then that the patch would need to be added and applied to the existing xl2tpd-1.3.10-1 package.

The linux-image kernel package on Ubuntu 18.04 is currently linux-image-4.15.0-13