The device isn't listed on the readme, because the PCI-6255 is not supported in DAQmx Base for Linux at the moment.Below are a few alternatives to consider:
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NI-DAQmx for Linux Frequently Asked QuestionsTechnical Assistance for Linux and National Instruments ProductsNI-DAQmx Base and Linux / OS X CompatibilityNI-DAQmx Base 15.0 - CentOS, RedHat, Scientific Linux, SUSE
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