#host_interface was removed in 0.9.0. Changing it to #host_only_interface= allows the code to execute, but VirtualBox fails, saying:
Failed to open/create the internal network 'HostInterfaceNetworking-' (VERR_INVALID_PARAMETER).
Failed to attach the network LUN (VERR_INVALID_PARAMETER).
This worked in 0.8.3:
#host_interface
was removed in 0.9.0. Changing it to#host_only_interface=
allows the code to execute, but VirtualBox fails, saying: