bug#78101: Acknowledgement (guix deploy fails with "In procedure map: Wrong type argument: #t")

[Arun Isaac]

I think this was a problem in my installed version of shepherd. The
shepherd socket vanished after system reconfiguring, and guix deploy was
unable to talk to it. I worked around as follows: I did a reconfigure on
the machine, upgrading to a newer version of shepherd, and rebooted.
Thereafter, I was able to guix deploy to the machine.