Trackball emulated middle-click not working

I’ve just done a clean install of PureOS from the latest image on the official website, and I’m trying to get Blender working the way I like.

The only problem I have is that I use a trackball (Kensington Orbit with scroll ring), and I can’t get Blender to recognize the “middle click” I do by clicking right and left buttons simultaneously.

There’s a setting in Blender itself labeled “emulate 3-button mouse”, but that seems to do nothing. I can’t find anything related in the OS settings either.

How do I get Blender (or possibly all software) to recognize my dual-clicks as middle clicks? Thanks.

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