[Bug 1969901] Re: network-manager fails to renew ipv6 address

[ArchPhoenix team]

The status says "Fix Released", was it released for 20.04 and later but
not for 18.04 ?

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https://bugs.launchpad.net/bugs/1969901

Title:
  network-manager fails to renew ipv6 address

Status in network-manager package in Ubuntu:
  Fix Released
Status in network-manager source package in Bionic:
  Incomplete

Bug description:
  [Impact]

   * This affects Ubuntu 18.04 where Network Manager version 1.10.6 is
  used.

   * Network manager might kill dhclient(6) and fail to start it again
     causing the IPv6 address to be lost on a network that uses mixed
     IPv4/IPV6.
     The network status will still be seen as online in gnome since ipv4
     is still active.
     The user then have to manually remove the dhcpv6 lease files and
     restart ipv6 connection/restart network manager to regain IPv6
     connectivity.

   * This is a cherry-pick from Network manager 1.10.8 (Ubuntu's version
     is based on 1.10.6):
     https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/7fbbe7ebee99785e38d39c37e515a64a28edef0f

   * Upstream bug:
     https://bugzilla.gnome.org/show_bug.cgi?id=783391

  [Test Plan]

   * The exact conditions for reproducing this bug on mixed IPv4/IPv6
     networks are not known but includes using both IPv4 and IPv6,
     both using dhcp.

  [Where problems could occur]

   * The change is in the dchp lease expiration handling so verify that
  there is no regression in dhcp renewals on different type of
  configuration include IPv6

  [Other Info]
   * We have tested this patch on a couple of clients where we have seen this
     this problem. If this patch is feasible to include in Ubuntu 18.04 we
     could request more users to test.

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