The latest version of NI-DAQmx for linux 19.1 appears not to support cDAQ-9181, according to the README file at URL http://www.ni.com/download/ni-linux-device-drivers-2019/8283/en/
Are there any plans to provide a linux driver for this chassis?
I'm sorry to say that there's no information regarding plans to release Linux driver for the chassis. The workaround, that you might've already tried is to use a Virtual Machine instead.
It is unfortunate that NI chose to treat Linux as a second-class citizen, considering its clear lead over windows in embedded applications. When making a selection, I did not expect that an ethernet-based device would be so poorly supported. The experience will without question influence my future decisions and recommendations to colleagues.