The Ubuntu Software Centre is to be REPLACED in Ubuntu 16.04 LTS.
Users of the Xenial Xerus desktop will find the familiar (and somewhat cumbersome) Software Centre no longer available.
GNOME’s Software application will take its place. New plugins will be created to support the Software Centre’s ratings, reviews and paid app features as a result of the switch.
The decisions were taken at a recent desktop Sprint.
Read more at OMG! Ubuntu!