I faced the same issue with my Lenovo G50. It all started asking me to update where I accepted and left it. It took a day still not updated so I removed my battery and started then it showed me that message in blue screen
Then I did this and it worked..!!!
*Press Ctrl alt delete .....
* make sure your laptop is connected to WiFi if it is previously connected it will auto connect.
* then it started autoupdating using my WiFi
* and finally got updated.
It worked for me I didn't tried on any other laptop .