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<font face="Lucida Console">I had the same problem when upgrading
from jessie to stretch (systemd 232-25) with a Cinnamon desktop.<br>
<br>
Opening a root terminal using "gksu /usr/bin/x-terminal-emulator"
(as in the menu) causes lots of dconf-CRITICAL error messages.<br>
<br>
These vanish if I edit the menu item to "gksudo </font><font
face="Lucida Console">/usr/bin/x-terminal-emulator" and add the
original user u to the sudo group vi "usermod -a -G sudo u".<br>
<br>
This also seemed to fix a less critical but similar error with
fuse complaining about a "bad mount point /run/user/1000/gvfs
Permission denied".<br>
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