I just re-installed my Ubuntu 14.04 64-bit and it worked well. But after updating and upgrading by running the commands:
apt-get update and apt-get upgrade the system is now not working after i rebooted it.
After booting it only shows the login interface, when i feed in my password and click enter it does not load the desktop environment, shows a black screen, then a blue screen and stops there.
I have searched on the Internet but can not get an response that is helping me.