[BRLTTY] Can't Get PowerBraille 80 to Connect

[wmichaelb at fuse.net]

I installed Debian Linux 9.4 on a Dell Pentium 4 for a blind friend, and then brltty 
first using gcc to configure, make, and install, and then when that didn't work, 
uninstalling it and using Debian's apt-get tool to install the package from their 
repositories. The serial PowerBraille 80 would not respond to either. Typing 
brltty as root gives me the version number of the software, but the system does 
not find brltty-test. Does someone have any suggestions to try to debug this 
install? Thanks in advance. 
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