For whatever reason, the modules package recommends the client
Depends: dkms (>= 188.8.131.52), perl:any, libc6-dev
Recommends: openafs-client (>= 1.8.0~pre5-1ubuntu1)
However, if that gets installed before the modules are ready, the
service tries to start and fails, but maybe fools systemd into
thinking it started correctly; so our sanity checks seem to fail on
new servers without a manual restart of the openafs client services.
By ignoring this recommends, we should install the modules, then the
client (which should start OK) in that order only.