Now that I have the library installed correctly, I get an error after
uploading a test sketch provided by ATAfruit.  I get some gibberish in
the serial monitor window for a little while, then the error shows.
The error is:

processing.app.SerialException: Error opening serial port '/dev/ttyACM0'.
processing.app.SerialNotFoundException: Serial port '/dev/ttyACM0' not
found. Did you select the right one from the Tools > Serial Port menu?

the first time I received this error, I was directed to a
troubleshooting site
(http://www.arduino.cc/en/Guide/Troubleshooting#upload) which had
among other things to suggest the following:

On Linux, the Uno and Mega 2560 show up as devices of the form
/dev/ttyACM0. These are not supported by the standard version of the
RXTX library that the Arduino software uses for serial communication.
The Arduino software download for Linux includes a version of the RXTX
library patched to also search for these /dev/ttyACM* devices. There's
also an Ubuntu package (for 11.04) which includes support for these
devices. If, however, you're using the RXTX package from your
distribution, you may need to symlink from /dev/ttyACM0 to
/dev/ttyUSB0 (for example) so that the serial port appears in the
Arduino software.

What does it mean to symlink from /dev/ttyACM0 to /dev/ttyUSB0, how do
I determine if that is necessary, and if it is, how do I do it?

Thanks again for the help.

-Denis
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