annoying GPG error on Virtualbox repository

[Rigved Rakshit]

> W: GPG error: http://download.virtualbox.org quantal Release: The
following
> signatures were invalid: BADSIG 54422A4B98AB5139 Oracle Corporation
> (VirtualBox archive signing key) <info at virtualbox.org>

Open Software Sources (software-properties-gtk), go to the Authentication
tab and remove the Oracle key. Then, run apt-get again. The issue should be
resolved.

Best Regards,
Rigved Rakshit

@Sent from my tab
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