The PE and your Linux seem not to be communicating over the USB network interface. Plug it up, and run the TFTP command. Once you launch it, run a ping from Linux terminal.
ping 192.168.2.101 and see of they are able to communicate. It looks to me like the TFTP is just waiting for a connection.
Linux should be 192.168.2.100 and the PE is set to 192.168.2.101 in the system variables.
-- Jim
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