Public bug reported:

Since upgrading to 16.04LTS my HP 255 laptop no longer suspends when the
lid is closed. The power management gui settings are correct, and
suspend used to work perfectly in 14.04LTS.

Suspend is still available from the system menu, and works correctly
when manually invoked from there or after a short power button press.

The reason I suspect unity-settings-daemon is blocking the lid close
action is that systemd-inhibit gives the following output.

     Who: neilw (UID 1000/neilw, PID 1669/unity-settings-)
    What: handle-lid-switch
     Why: Multiple displays attached
    Mode: block

I do not have multiple displays attached, xrandr gives;

Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 
344mm x 194mm
   1366x768      60.07*+  40.04  
   1280x720      59.86  
   1152x768      59.78  
   1024x768      59.92  
   800x600       59.86  
   848x480       59.66  
   720x480       59.71  
   640x480       59.38  
HDMI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)

The version installed is as follows;

unity-settings-daemon:
  Installed: 15.04.1+16.04.20160209-0ubuntu1
  Candidate: 15.04.1+16.04.20160209-0ubuntu1
  Version table:
 *** 15.04.1+16.04.20160209-0ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: unity-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1577906

Title:
  Laptop sleep on lid close apparently blocked by unity-settings

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