Interestingly, ubuntu forgets the fact that you chose to use the proprietary Nvidia driver! After upgrade (of release) please go to settings and update the driver!
Please note There are two types of drivers that we can use: Open Source and Proprietary drivers. Open Source drivers have been created by the Linux community to function with certain video cards, and most video cards have an Open Source driver available. In addition, older hardware is typically better supported by Open Source drivers. In some cases, there is no proprietary driver for the graphics card (such as non-HD Radeons) and installing such a driver will only stop the Open Source driver from functioning correctly.