Comment 4 for bug 1836713

Upgrading an install that exhibits this bug is a major trip-hazard, as the act of upgrading the package to the new version will call the broken prerm to execute, resulting in the -dpdk binary being disabled again.

To avoid this:

sudo sed -i "/update-alternatives/d" /var/lib/dpkg/info/openvswitch-switch-dpdk.prerm

before completing the package upgrade thus ensuring the -dpdk version of the binary never gets removed.