This bug was fixed in the package gnome-settings-daemon -
3.21.90-2ubuntu1
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gnome-settings-daemon (3.21.90-2ubuntu1) yakkety; urgency=medium
* Merge with Debian (LP: #1620177). Remaining changes:
+ Split out schemas into gnome-settings-daemon-schemas so
unity-settings-d
** Description changed:
gnome-settings-daemon itself is only shipped in Ubuntu GNOME. The
schemas are used in several different Ubuntu flavors but the schemas
were not changed in the 3.22 cycle.
The new release is fairly quiet, mostly bug fixes. I've been running
gnome-settings-daemon
