Symptoms
Limited functionality is seen when using one of the Dell WD19/WD19S series docks attached to a Precision 5520 mobile workstation running Ubuntu 18.04 LTS.
Affected Products
Precision 5520 Mobile WorkstationDell Dock WD19/WD19S, WD19DC/WD19DCS & WD19TB/WD19TBS
Resolution
While this configuration may work with limited functionality, it is not supported by Dell Support as it is not been validated by our engineering group.
This is because:
The Precision 5520 Mobile Workstation was validated for support with Ubuntu 16.04 (That was what was available when this system was released)The various WD19/WD19S series docks were only validated for support with Ubuntu 18.04 LTS (For the same reason)