Heads-up: rebooting after the switch to the Shepherd

[Ludovic Courtès]

If you run ‘guix system reconfigure’ for the first time since the
dmd → shepherd transition last week, you may find the ‘reboot’ command
is non-functional right after ‘reconfigure’ has completed:

  # reboot
  error: connect: /var/run/shepherd/socket: No such file or directory

The solution is to instead run:

  # /run/booted-system/profile/sbin/reboot

This one is able to talk to the running dmd, whereas after
reconfiguration, ‘reboot’ is the new Shepherd client, which cannot talk
to the old dmd.

Ludo’.