I followed these instructions when I installed VirtualBox on my 32-bit Desktop PC:
1. Download the Linux file from VirtualBox website. The file depends on your Linux distro and whether you have 32 or 64-bit CPU
2. Navigate to where you downloaded the file and: sudo dpkg -i [file name]
3. sudo apt-get update
4. sudo apt-get install libsdl-net1.2-dev
[For the GUI. Now the Oracle VM Virtual Box appears in system
5. sudo apt-get install dkms
[Dynamic kernel module support. With dkms installed, the
VirtualBox should always work automatically, and automatically
rebuild when the host kernel gets an update]
But for Ubuntu 12.04.2 in this 64-bit Pavilion, I just followed steps 1-3. The libsdl-net1.2-dev and dkms must be part of the 12.04.2 installation.
I set up Win7 in VirtualBox. This YouTube video seems pretty ok to follow. http://www.youtube.com/watch?v=ZaHbmbrqjvQ I inserted my Windows 7 OEM DVD and 30 minutes later it was installed ! There was one snag however. I got this blivit message right off:
"VT-x/AMD-V hardwre acceleration has been enabled, but is not operational. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot. Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer."
I thought I remembered seeing something like this in BIOS. Sure enough, there's a menu entry entitled 'Virtualization Technology, disable or enable'. It was disabled. The item specific help text said this: "Hardware VT enables a processor feature for running multiple simultaneous Virtual Machines allowing secialized software applications to run in full isolation of each other. HP recommends that this feature remain disabled unless specialized applications are being used." I enabled Virtualization Technology. Problem solved.
After using Ubuntu and Windows in dual-boot for a long time, this seems more elegant to me. Not having to restart to get from one to the other is certainly convenient. We'll see how it goes though. When I finish getting everything set up the way I normally do, I'll post some screen shots for anyone who's interested. I use Cairo-Dock instead of Unity and a pretty ok Conky. Note: No Win7 specific drivers needed either. Cool !!