"Shutdown" app doesn't do anything in deb-based Unity8

Or we could simply hide them, as we currently do for unity-control-center modules (there's also "Reboot" and "Logout" menu entries fwiw)

I would rather we didn't bake in too many copies of Gnome functionality.

IMHO it's OK for Gnome session tools to not work under Unity8. In the future they possibly won't be there at all.

@Daniel, fair. But this is just the newer API (as far as I can tell) for an existing GNOME DBus API we already supported. And it's not just GNOME session tools; other legacy apps might call those APIs.

This bug was fixed in the package unity8 - 8.15+17.04.20170321-0ubuntu1

---------------
unity8 (8.15+17.04.20170321-0ubuntu1) zesty; urgency=medium

  [ Albert Astals Cid ]
  * Signal aboutToShow (LP: #1664578)
  * Support Panel top level items to be disabled (LP: #1670694)
  * Improve Launcher ←→ touch menu interaction (LP: #1667620, #1671069)
  * Fix real world submenus (e.g. kate) not getting their first item
    selected on open (LP: #1666859)

  [ Daniel d'Andrada ]
  * Really disable the window decoration when in staged mode (LP:
    #1670361)
  * Don't let clients resize their surfaces while in staged
    (phone/tablet) mode (LP: #1670390)
  * TopLevelWindowModel: don't put hidden windows in the model (LP:
    #1665286)

  [ Lukáš Tinkl ]
  * Reset always-show-osk gsetting on startup to default value (false
    atm)
  * Fix the restored-to position with Miral due to the state changes
    being async (LP: #1669819)
  * Add a cursor name fallback mapping "grabbing" -> "closedhand" for
    Breeze
  * Fix unsnapping a maximized window from the panel (LP: #1671721)
  * Disable altDrag feature outside windowed mode

  [ Michael Terry ]
  * Don't lock the screen for guest users or users in the nopasswdlogin
    group. (LP: #1644237)
  * Support GNOME-style logout DBus API (making the Logout, Reboot, and
    Shutdown launcher commands work) (LP: #1673229)

  [ Michael Zanetti ]
  * Add support for closing apps from the spread with "Q" (LP: #1670327)
  * hide "private" launcher quicklist entries when the greeter is locked
    (LP: #1667649)
  * add surface titles to launcher's quicklist (LP: #1661668)
  * properly reset the drawer state when cancelling a horizontal drag
    (LP: #1669536)
  * fix the focus moving correctly between launcher and drawer (LP:
    #1669880)
  * unfocus the drawer's textfield when it is moved (LP: #1669839)

  [ Pete Woods ]
  * Fix up indicators-client after refactoring (LP: #1672797)

 -- Michał Sawicz <email address hidden> Tue, 21 Mar 2017 10:58:13 +0000