I installed bumblebee and now the problem is fixed. My computer did hang during the bumblebee installation, but after rebooting and running "sudo dpkg --configure -a" and rebooting again, the issue is fixed.
I used this command to install bumblebee: sudo apt-get install bumblebee bumblebee-nvidia primus linux-headers-generic bbswitch-dkms mesa-utils nvidia-331-updates -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1310276 Title: Computer hangs whem opening system settings Status in “linux” package in Ubuntu: Incomplete Bug description: My computer hangs when I open the System Settings in Ubuntu 14.04. This was a clean install and I have already re-installed 3 times, but the issue still exists. This also happens when I open any setting window (appearance, battery ,etc.). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1310276/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
