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I have install Virtualbox 4.0.4-OSE on my Ubuntu 11.04. I want to install the guest additions of Virtualbox. but I've gotten this error:

 Failed to open the CD/DVD image /home/bigbang/.VirtualBox/VBoxGuestAdditions_4.0.4.iso.
 The medium '/home/bigbang/.VirtualBox/VBoxGuestAdditions_4.0.4.iso' can't be used as the requested device type.

The step I do for install it is:

Devices > Install Guest Additions , then click yes to download the required .iso file from the internet and then click mount button after the file is downloaded and then it gives me the error.

Edited: My host is Ubuntu and the guest os is XP.

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My host is Ubuntu and the guest os is XP. – hd. Jan 27 at 14:47
Add that to the question it self please, use the edit button bellow it. – Bruno Pereira♦ Jan 27 at 14:49
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1 Answer

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To mount and use guest additions you first have to make sure virtualbox-guest-additions is installed and ready to use. Pop into terminal and type:

sudo apt-get install virtualbox-guest-additions
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Thank you.It is installed now. – hd. Jan 27 at 21:01
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