After upgrading 14.10 to the latest 3.16 kernel today, my Unity GUI is messed up. I was able to create a folder and open it, but if I navigate to the /bin folder, right-click on bash, then select Run, nothing happens. I can't start any program.
Ctrl+Alt+T doesn't work, but I can get to the terminal by pressing Ctrl+Alt+F1. (Thanks to @spqpad for pointing that out!)
I am running this as a VirtualBox 4.3.20 guest. I did have the Guest Extensions for 4.3.18 installed when I upgraded all my packages, including the kernel, with the intent of installing the new Guest Additions after a reboot. I later uninstalled Guest Extensions using ./VBoxLinuxAdditions.run uninstall off the ISO. That didn't change anything. Why was I running 4.3.18 Guest Extensions? I upgraded VirtualBox right before upgrading all my guest OS's packages.
Here is all I see: