Shows up in 16.04.5 (4.15.0-43-generic) too.

In the end, despite all the above ipv6.disable = 1 additions to
sysctl.conf and reboots, the only sure-fire way I found to reliably
disable ipv6 was to add ipv6.disable=1 to grub:

$ grep ip /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash"
$ sudo update-grub
$ sudo reboot

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  Using sysctl to permanently disable IPv6 doesn't have any effect

Status in linux package in Ubuntu:

Bug description:
  Shows up in version 18.04 of Ubuntu.

  I added the following 2 lines in /etc/sysctl.d/99-sysctl.conf and 

  Rebooting my machine sets those parameters for "all" and "default" but not for
  the sysctl options of my network interface:
  net.ipv6.conf.all.disable_ipv6 = 1
  net.ipv6.conf.default.disable_ipv6 = 1
  net.ipv6.conf.ens160.disable_ipv6 = 0

  I use disable_ipv6 above as an example.
  I've also verified this with the promote_secondaries option of ipv4.

  I can always restart  systemd-sysctl.service at every boot and this will
  set net.ipv6.conf.ens160.disable_ipv6 to 1. Unfortunately though this won't
  work for devices that are hot-plugged.

  Other info:

  - version signature: Ubuntu 4.15.0-20.21-generic 4.15.17
  - lspci is attached

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