[Bug 1949643] Re: iptables-persistent unconditionally drops existing iptables rules

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https://bugs.launchpad.net/bugs/1949643

Title:
  iptables-persistent unconditionally drops existing iptables rules

Status in iptables-persistent package in Ubuntu:
  Confirmed
Status in iptables-persistent package in Debian:
  Fix Released

Bug description:
  [Impact]

  The iptables-persistent plugins/{15-ip4tables,25-ip6tables}
  use ip[6]tables-restore without --noflush unconditionally.

  This doesn't play along well with ufw, which starts before
  netfilter-persistent typically, and gets its rules flushed.

  This makes `ufw status` return that ufw is disabled, which
  is misleading, as `ufw.service` is enabled and ufw actually
  loaded all its rules correctly (but they were flushed later.)

  Some images ship iptables-persistent rules, thus are subject
  to this issue if ufw is used.

  [Workaround]

  Disable the netfilter-persistent.service unit, after rules
  have been migrated to ufw.

  [Fix]

  Proposed in Debian bug #998416 [1], Salsa Merge Request [2].

  [Test Steps]

  See the Debian bug.

  [1] https://bugs.debian.org/998416
  [2] https://salsa.debian.org/debian/iptables-persistent/-/merge_requests/3

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