Look like a potential patchset to backport without having to bump
version in stable release:

21ba5b38 ip{,6}tables-restore: Don't accept wait-interval without wait
d89dc47a iptables-restore/save: exit when given an unknown option
65801d02 iptables-restore.8: document -w/-W options
999eaa24 iptables-restore: support acquiring the lock.

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https://bugs.launchpad.net/bugs/1791958

Title:
  iptables-restore is missing -w option

Status in iptables package in Ubuntu:
  Confirmed

Bug description:
  For CRIU we need to have iptables version 1.6.2 which includes the
  '-w' option in iptables-restore.

  This is a request to update iptables to 1.6.2 in 18.10 and if possible
  backport the necessary changes to 18.04.

  The CRIU project gets right now many bug reports (mostly in the
  combination LXD + CRIU) due to the missing '-w' option in iptables-
  restore. Especially as 18.04 will be around for some time it would be
  good to have iptables-restore available with '-w'.

  This is one example bug report: https://github.com/checkpoint-
  restore/criu/issues/551

  But not only CRIU would benefit from this change. It seems also
  problematic with Kubernetes:
  https://github.com/kubernetes/kubernetes/pull/60978

  So if possible, please update iptables to 1.6.2 (or backport changes)
  to support -w in iptables-restore.

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