I have an emachines E525 I had to put the ISO on a blank disk and set the boot up USB CD-ROM and it does not see the CD, I tried the ISO on virtual box and it will not load it.
Failed to open the optical disk file C:\Users\DONNA\Desktop\ubuntu-12.04.3-desktop-i386.iso
.
Could not get the storage format of the medium 'C:\Users\DONNA\Desktop\ubuntu-12.04.3-desktop-i386.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: VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)