I've successfully installed Debian in my VirtualBox on Windows 8.1, but I wished to have Ubuntu. My machine is HP Envy with Intel i7 and 8GB RAM, NVidia GeForce GT 750M.
First strange thing I encountered is that the VirtualBox does not offer 64-bit Linux OS type alternative (and I actually was not able to run 64-bit Debian either). I've installed Ubuntu 14.04.1 32-bit. All I saw is a blank desktop.
I've read quite a bit on the issue and tried things. For example I updated NVidia drivers and enabled the Unity plug-in by the ccsm. But after I enter my login I still see a blank desktop and cannot even envoke a terminal with Ctrl-Alt-T.
dmesg reveals the following:
nvidia: module license 'NVIDIA' taints kernel.
nvidia: module verification failed: signature and/or required key missing - tainting kernel
NVRM: No NVIDIA Graphics adapter found!
Any ideas how to troubleshoot?