Installing Virtualbox expansion pack. problem and solution

was ripping my hair out trying to get the expansion pack to install. then i got the bright idea of running virtualbox as root and installing the expansion pack that way. no problem works great.

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Running as Vbox as root isn't a good idea in itself. It crudely works though, as you do need admin rights to install the extension pack.

Did you see the relevant Howto which doesn't require running as root?