Today we updated our default package manager apt to its new version 1.0.

This one comes with a new user interface and resolver accessible via the command line apt command.
Toghether with this update we also upgraded Packagekit to version 1.0 and Apper 0.9.1. 

During the update process with apper it will prompt you with an error message. Ignore this and reboot the system to fully be able to use apper again.