First try with
$ sudo apt-get install -f
If it doesn't work & the error still persist,
simply remove the old library as
$ sudo apt-get remove libpackagekit-glib2-16
OR
$ sudo dpkg -r libpackagekit-glib2-16
Whichever works for you.
Then freshly install your package. If the error about dependancy still persist, install the required library with following command.
$ sudo dpkg -i libpackagekit-glib2-14
OR
$ sudo apt-get install libpackagekit-glib2-16
Finally you can remove the dependancies with the first command provided in this answer.