Only very quick test... but plugged it into older Dell Optiplex SFF system running Ubuntu 16.04 and was immediately recognized and just worked. Offered good signal strength.
For a Linux based system, it just-works; However, there was some research put into selecting this device for that reason
As mentioned by others, it's a bit big; When placing directly into the PC, it does obscure the adjacent USB ports, Depending on the orientation of the USB ports, the antenna may face down into the table/floor surface as was the case on my SFF Dell computer.