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This is a true server, so no GUI to keep down maintenance.

Install KVM

Upload ISO images into 

Setup Client Manager on Separate Machine

Best to use Ubuntu default Desktop. I'm using the Ubuntu default desktop in a VMWare Fusion on my iMac (link to this as separate article where the Ubuntu desktop is also stripped down).

Install Virtual Manager,

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There's a tricky thing here  "Spice server" to "VNC server" ... look up how to make "VNC server" the default for VM creations.

VNC... Ensure you have good enough resolution... lookup how to refresh vnc screen....