I can also confirm that this bug still exists. I tried all above solutions, but these did not helped me. I am also getting black screen if I am using NVIDIA adapter.
OS: Ubuntu 14.04.1 64bit Laptop: Acer E5-571G GPU(s): GeForce GT 840 and Intel HD 4400 Desktop: Unity Kernel: 3.13.0-45-generic CPU: Intel® Core™ i5-4210U -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1362848 Title: ubuntu 14.04 after install nvidia binary driver 331.89 black screen and freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1362848/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs