I assume that you followed to process of attaching 2 virtual network interfaces (Hypervisor default, bridged to your ethernet interface) and the 80GB second disk.
Did you get to point where you ran the initial configuration for ClearPass, the process where you set the appliance type, the management port IP, optional the data port IP, NTP, etc?
If you did, can you ping from the ClearPass to your host? Can you ping from your host to ClearPass? Can you ping from ClearPass to your default gateway?
Are you trying to access the ClearPass WebUI from your Linux host? Or from a remote system?