Ubuntu VM 

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Problem: make has problems finding symlinks; e.g.

Some versions of VMWare do not support symlinks in shared folders.
Use a directory on the guest filesystem.
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Problem: shared library not found

may have recently installed library, and need to run ldconfig
try sudo ldconfig

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Problem: 
 commands to sensor node work intermittently;
 commands sent seem to be received OK by sensor node, but replies are incorrect
 both snTest and testsn exhibit Tx OK/Rx Fail

USB - serial converter causes a timing problem (root cause?). 
Known problem: 
Keyspan USA-19HS w/ Ubuntu 12.04

Known OK:
Digi Edgeport 22c w/ Ubuntu 12.04