Requested 'dbus-1 >= 1.8' but version of dbus is 1.6.18
Xenial reports to have dbus 1.10
(Trusty seems to only has 1.6 available so you probably won’t be able to apt-get anything newer, either).
So you need to migrate to dist: xenial. Or use an older version of dbus-python.
Also the link I gave earlier says that you shouldn’t run with system site packages.