[Bug 1836713] Re: upgrade of openvswitch packages resets alternative binaries to auto

[James Troup]

This broke several customer Bionic DPDK based clouds today.

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https://bugs.launchpad.net/bugs/1836713

Title:
  upgrade of openvswitch packages resets alternative binaries to auto

Status in openvswitch package in Ubuntu:
  Fix Released
Status in openvswitch source package in Bionic:
  Triaged
Status in openvswitch source package in Disco:
  Won't Fix
Status in openvswitch source package in Eoan:
  Fix Released

Bug description:
  Upgrading and existing openvswitch installation which has been
  manually configured to use the DPDK alternative binary using:

    sudo update-alternatives --set ovs-vswitchd /usr/lib/openvswitch-
  switch-dpdk/ovs-vswitchd-dpdk

  results in the ovs-vswitchd being reset back to 'auto':

  Setting up openvswitch-switch (2.11.0-0ubuntu2~cloud0) ...
  update-alternatives: using /usr/lib/openvswitch-switch/ovs-vswitchd to provide /usr/sbin/ovs-vswitchd (ovs-vswitchd) in auto mode

  
  The prerm maintainer scripts always remove the alternatives, which purges any manual setting done of the binaries.

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