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.