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When trying to add two VirtualBox virtual machines which have been originally copied (via simple file copy) from the same source, on adding the second one I get the message
Failed to open virtual machine [...]
Trying to open a VM config [...] which has the same UUID as an existing virtual machine.
(Yes, the machines should have been cloned instead of simple file copy, but it is too late at this point.)
1This worked for me, but I also had a DVD "inserted" in the VM that I was manually copying. When I edited my .vbox file, I had to change
<DVDImages>...</DVDImages>
to just<DVDImages />
to "eject" the DVD with the duplicate UUID. – JPhi1618 – 2014-12-01T20:31:08.933Note that if the VM has snapshots you'll also have to do the same steps on the vdi files in the "Snapshots" folder. – laurent – 2015-06-30T08:05:14.853