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For newer QGIS versions, an option is to use an adaption of the solutions proposed to Colouring points in the same colour as their nearest point/polygon from another layer in QGIS. With overlay_nearest(), you can address features on another layer or the current layer, using the variable @layer.
The basic is to use the new overlay expressions, available since ...
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On my installation of QGIS 3.10.4 on Ubuntu 20.04 I had to install SAGA manually via
sudo apt install saga
After restarting QGIS, SAGA was then listed in the processing toolbox.
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