Public bug reported:

With the latest update to 0.0.20191127-wg1~bionic, starting a wireguard
tunnel results in the following error message:

~$ sudo wg-quick up wg0 
[#] ip link add wg0 type wireguard
[#] wg setconf wg0 /dev/fd/63
[#] ip -4 address add X.X.X.X/32 dev wg0
[#] ip link set mtu 1420 up dev wg0
[#] resolvconf -a tun.wg0 -m 0 -x
[#] wg set wg0 fwmark NNNNN
[#] ip -6 route add ::/0 dev wg0 table NNNNN
[#] ip -6 rule add not fwmark NNNNN table NNNNN
[#] ip -6 rule add table main suppress_prefixlength 0
[#] ip6tables-restore -nw
ip6tables-restore: invalid option -- 'w'
[#] ip -4 route add 0.0.0.0/0 dev wg0 table NNNNN
[#] ip -4 rule add not fwmark NNNNN table NNNNN
[#] ip -4 rule add table main suppress_prefixlength 0
[#] sysctl -q net.ipv4.conf.all.src_valid_mark=1
[#] iptables-restore -nw
iptables-restore: invalid option -- 'w'

Further system information:
$ lsb_release -rd
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
$ apt-cache policy wireguard
wireguard:
  Installiert:           (keine)
  Installationskandidat: 0.0.20191127-wg1~bionic
  Versionstabelle:
     0.0.20191127-wg1~bionic 500
        500 http://ppa.launchpad.net/wireguard/wireguard/ubuntu bionic/main 
amd64 Packages
        500 http://ppa.launchpad.net/wireguard/wireguard/ubuntu bionic/main 
i386 Packages
$ apt-cache policy wireguard-tools 
wireguard-tools:
  Installiert:           0.0.20191127-wg1~bionic
  Installationskandidat: 0.0.20191127-wg1~bionic
  Versionstabelle:
 *** 0.0.20191127-wg1~bionic 500
        500 http://ppa.launchpad.net/wireguard/wireguard/ubuntu bionic/main 
amd64 Packages
        100 /var/lib/dpkg/status
$ apt-cache policy wireguard-dkms 
wireguard-dkms:
  Installiert:           0.0.20191127-wg1~bionic
  Installationskandidat: 0.0.20191127-wg1~bionic
  Versionstabelle:
 *** 0.0.20191127-wg1~bionic 500
        500 http://ppa.launchpad.net/wireguard/wireguard/ubuntu bionic/main 
amd64 Packages
        500 http://ppa.launchpad.net/wireguard/wireguard/ubuntu bionic/main 
i386 Packages
        100 /var/lib/dpkg/status

** Affects: wireguard (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1855096

Title:
  iptables-restore: invalid option -- 'w'

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