Comment 0 for bug 1580101

this is due to the package "openwswitch-datapath-dkms" is hardcoded as plugin dependency [1]

according to [2] it is not needed for kernels >= 3.13, so it is only needed for Ubuntu < 14.04, although it is present in upstream trusty repos.

The problem is this package is completely absent from upstream xenial repos (currently 4.4 kernel), so installing Ironic on 16.04 fails early on package installation step.

I'm not sure if devstack still officially supports ubuntu < 14.04, that is whether we can remove this package from the dependencies completely. And as xenial support in devstack is not there yet officially AFAIK, feel free to set Low priority for this bug.

[1] http://git.openstack.org/cgit/openstack/ironic/tree/devstack/files/debs/ironic#n12
[2] http://git.openstack.org/cgit/openstack-dev/devstack/tree/lib/neutron_plugins/ovs_base#n56