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I am trying to upgrade 2 Mac mini Servers from OS X Server 10.6 to 10.7. I get the following error:

enter image description here

The additional components needed to install Mac OS X can't be found.

Googling for this message only returns a handful of results, which aren't too helpful.

I have purchased and installed OS X Lion Server as well.

What could be causing this problem?

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I once made a short try to upgrade it, but gave up on it due to similar reasons. See this discussion for more stories (interesting link in the last post there). OS X Server is dead and 10.7 server is nothing but a final slap in the face of once loyal customers. – Sven Mar 20 '12 at 0:34

What support do you use to install Lion ? (Recovery Partition, Recovery Assistant, InstallESD) Have verified Tech Spec first ( ?

Does not looks like a upgrade (migration) issue, but more a install support issue.

Then if you are still stuck, you make a clone You erase and install Lion Server, then import data from the clone.

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