From owner-freebsd-virtualization@FreeBSD.ORG  Wed Oct  1 19:14:07 2014
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Date: Wed, 01 Oct 2014 21:07:43 +0200
From: gabor@zahemszky.hu
To: <freebsd-virtualization@freebsd.org>
Subject: VBox extension pack installation failed
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Hi!

Without the extension pack, I couldn't create USB2.0 interface in my 
VM-s.
So I tried to install it. First I found out, that there is an 
"installed"
version of it named VNC. After downloading it, I tried to install from
File / Preferences / Extensions / Add package. But it failed with an
error message about /dev/ctty. As I first tried as a normal user, next
I tried it as root. (xhost +local: ; VirtualBox). Now the installation
started, but failed with "Failed to locate the main module 
(VBoxPuelMain)"
And after it I have a non-functional "Oracle VM VirtualBox Extension 
Pack".
The difference between the original installed version and the failed 
version,
is that the original has version the same version number with an _OSE 
postfix
in it.

Here is the full error message:

===
Failed to install the Extension Pack 
/home/zgabor/Oracle_VM_VirtualBox_Extension_Pack-4.3.16-95972.vbox-extpack.

Failed to locate the main module ('VBoxPuelMain').

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ExtPackManager
Interface: IExtPackManager {3295e6ce-b051-47b2-9514-2c588bfe7554}

===

So how can I enable USB 2.0 as it needs the extension pack?

Thanks,

Gábor < Gabor at Zahemszky dot HU >