Splashtop requires that the network interface in your system be managed via Network Manager. Amahi/Ubuntu systems prior to November 31st, 2012 did not have NetworkManager support and would need to be converted to using Network Manager to use Splashtop.
TO DO: need We are testing a script to put here the steps to reconfigure your automatically migrate a network device configuration for an Amahi HDA to use NetworkManagerNetwork Manager.