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In my Ubuntu 13.04 Virtualbox cannot install the extension package.

ErrorInstallazione dell'Extension Pack
/home/.../..../Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack non riuscita
The installer failed with exit code 1: Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated..

Codice 'uscita: NS_ERROR_FAILURE (0x80004005)
Componente: ExtPackManager
Interfaccia: IExtPackManager {3295e6ce-b051-47b2-9514-2c588bfe7554}

Have you any idea?

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To install the extension package, download it from the website.

Open a terminal and go to an arbitrary directory, then enter


After the download finished, enter

sudo VirtualBox ./Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack

Virtualbox will start and ask you to accept the license. Scroll down and accept it. The restart the application.

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Thank's, now it is installed!. i forget needed "sudo". – Fabio May 20 '13 at 11:22

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