com.apple.ubd and launchd.peruser delaying shutdown. Help interpret log?

After trying to reset the timeouts to get a reasonably quick shutdown (have tried the other recommendations), I keep seeing that com.apple.ubd looks like it does not want to quit on shutdown. I'm not sure what the function of the launchd.peruser is, or whether to mess with it at all.

Question is - is there a timeout command to enter to terminate this process at shutdown, or any other way to make it behave?

Suggestions appreciated.

1577398 com.apple.launchd.peruser.501 275 com.apple.ubd 407 Job is active: PID is still valid

1577401 com.apple.launchd.peruser.501 275 com.apple.ubd 407 Job was sent SIGTERM.

1577403 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Still have submanagers.

1577405 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Submanager: Aqua

1577407 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Handled kevent.

1577408 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG demux succeeded.

1577415 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG request.

5003555 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG callout: 137000

5003567 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Dispatching kevent (ident/filter): 140419744665600/-7

5003573 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Shutdown timer firing.

5003576 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Still alive with 1/0 (normal/anonymous) children.

5003580 com.apple.launchd.peruser.501 275 com.apple.ubd 407 PID is still valid

5003610 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Handled kevent.

5003613 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG demux succeeded.

5003619 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG request.

10003498 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG callout: 137000

10003510 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Dispatching kevent (ident/filter): 140419744665600/-7

10003515 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Shutdown timer firing.

10003518 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Still alive with 1/0 (normal/anonymous) children.

10003523 com.apple.launchd.peruser.501 275 com.apple.ubd 407 PID is still valid

10003572 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Handled kevent.

10003574 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG demux succeeded.

10003581 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG request.

15003506 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG callout: 137000

15003518 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Dispatching kevent (ident/filter): 140419744665600/-7

15003523 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Shutdown timer firing.

15003527 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Background: Still alive with 1/0 (normal/anonymous) children.

15003531 com.apple.launchd.peruser.501 275 com.apple.ubd 407 PID is still valid

15003558 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Handled kevent.

15003561 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG demux succeeded.

15003567 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG request.

20001139 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG callout: 137000

20001154 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Dispatching kevent (ident/filter): 140419725941848/-7

20001160 com.apple.launchd.peruser.501 275 com.apple.ubd 407 Dispatching kevent callback.

20001164 com.apple.launchd.peruser.501 275 com.apple.ubd 407 Exit timeout elapsed (20 seconds). Killing

20001190 com.apple.launchd.peruser.501 275 com.apple.ubd 407 Sent SIGKILL signal

20001193 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 Handled kevent.

20001195 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG demux succeeded.

20001204 com.apple.launchd.peruser.501 275 com.apple.launchd.peruser.501 275 MIG request.