Error while dpkg the virtualbox-5.0_5.0.4-102546-Ubuntu-trusty_amd64.deb "Failed to create the Virtualboxclient object"?

Question

I am using ubuntu 14.04LTS.

I ran

$sudo dpkg -i virtualbox-5.0_5.0.4-102546-Ubuntu-trusty_amd64.deb 
$virtualbox

Error:

Failed to create VirtualBoxClient COM Object.The application will now terminate.

Callee RC: 
NS_ERROR_FACTORY_NOT_REGISTERED (0x80040154)

Answer 1

We resolved this in chat here.

Quick explanation of how we resolved it:

OP had downloaded the .deb file from here.

1. Run sudo apt-get purge virtualbox
2. Reboot the machine
3. Run sudo dpkg -i virtualbox-5.0_5.0.4-102546-Ubuntu-trusty_amd64.deb.
4. Run virtualbox and it now works!

Apparently a reboot was required.