updating for ubuntu 13.10

When using ubuntu 13.10, `which "$DCONF" > /dev/null 2>&1` was true, leading BASE_KEY to be set but  `[[ -n "`$DCONF list $BASE_KEY/`" ]]` was not which set BASE_KEY to the wrong value.

I also added to the README that in ubuntu you have to have the default profile selected for this to work.