A new big update is arriving for all Neptune 3.x users currently.
We provide a big update for packagekit and apper aswell as systemd 204 which brings a new udev version.
This Update brings usability improvements and stability improvements when it comes to the default software and upgrade center apper.

After the update you need to reboot.
Note: Apper might show an unknown error after successfully upgraded. You can dismiss this error message and reboot the computer.