Firstly there's a reason people don't just tell you to install Virtualbox through the package manager ..
a) it won't be the latest version
b) it will likely install the OSS version that doesn't support things like USB pass through.
So the first thing you want to do is remove it:
sudo apt-get remove virtualbox
Now send the output from:
dpkg -l | grep virtualbox
rc virtualbox 4.1.12-dfsg-2ubuntu0.1 x86 virtualization solution - base binaries
rc virtualbox-4.1 4.1.12-77245~Ubuntu~precise Oracle VM VirtualBox
ii virtualbox-guest-dkms 4.1.12-dfsg-2ubuntu0.1 x86 virtualization solution - guest addition module source for dkms
ii virtualbox-guest-utils 4.1.12-dfsg-2ubuntu0.1 x86 virtualization solution - non-X11 guest utilities
ii virtualbox-guest-x11 4.1.12-dfsg-2ubuntu0.1 x86 virtualization solution - X11 guest utilities
rc virtualbox-qt 4.1.12-dfsg-2ubuntu0.1 x86 virtualization solution - Qt based user interface
Mad Penguins suggestion -
KVM requires hardware acceleration, so won't work with all CPU's .. but there's an easy way to find out if your CPU supports everything KVM requires.
sudo apt-get install cpu-checker
Output (cpu chk)=
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
The following NEW packages will be installed
0 upgraded, 2 newly installed, 0 to remove and 56 not upgraded.
Need to get 15.6 kB of archives.
After this operation, 123 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
precise/main msr-tools amd64 1.2-3 [9,052 B]
precise/main cpu-checker amd64 0.7-0ubuntu1 [6,538 B]
Fetched 15.6 kB in 0s (84.7 kB/s)
Selecting previously unselected package msr-tools.
(Reading database ... 171678 files and directories currently installed.)
Unpacking msr-tools (from .../msr-tools_1.2-3_amd64.deb) ...
Selecting previously unselected package cpu-checker.
Unpacking cpu-checker (from .../cpu-checker_0.7-0ubuntu1_amd64.deb) ...
Processing triggers for man-db ...
Setting up msr-tools (1.2-3) ...
Setting up cpu-checker (0.7-0ubuntu1) ...
now what is the output from:
INFO: /dev/kvm does not exist
HINT: sudo modprobe kvm_amd
INFO: Your CPU supports KVM extensions
KVM acceleration can be used
Send the output from those, and we'll go from there
Mark to the rescue - again!
P.S. Please note, I have finally sorted out the "quote-unquote" procedure.