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I think the problem is that as the error message says, you don't have enough network interfaces available.
The installation process creates a network bridge and therefore you need 3 network interfaces: eth0 ist for management access, eth1 and eth2 are the ports for the bridge (an IP will not be assigned for these two interfaces) and at last the br0 interface. When you don't provide enough interfaces during the installation process, the bridge will not be configured and this could be the problem.