SSL 2 & SSL 2+ are not officially supported with Linux. However they are class compliant USB devices, and many Linux Operating systems and audio drivers support class compliant devices.
We have tested the unit with Ubuntu versions 18.04.3* and 19.10* and 20.04.*
This has also been tested with Fedora 32.*
*Please note this was simple does the system see the unit does the system pass audio in and out of the unit. We did not extensively test these systems