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I get the following error when Ii try to install Ubuntu Server to virtual box

Failed to open the optical disk file C:\Users\Joshua Oche

Could not get the storage format of the medium 'C:\Users\Joshua Oche
Idoko\Desktop\ubuntu-12.04.3-server-amd64.iso' (VERR_NOT_SUPPORTED).

Result Code: VBOX_E_IPRT_ERROR (0x80BB0005) Component: Medium
Interface: IMedium {05f2bbb6-a3a6-4fb9-9b49-6d0dda7142ac} Callee:
IVirtualBox {fafa4e17-1ee2-4905-a10e-fe7c18bf5554} Callee RC:

Can someone help me rectify the problem

share|improve this question
Did you choose the right OS under settings? –  Mitch Dec 21 '13 at 10:44
Your .iso file may be corrupted. Check the MD5SUM or try to download again from: releases.ubuntu.com/precise –  Takkat Dec 21 '13 at 11:39

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