I downloaded gridded soils data from gSSURGO and used ArcGIS to export the raster to a GeoTiff of keys for use on Linux. On my Ubuntu machine, I have imported the GeoTiff to QGIS as a raster layer, and have imported the geodatabase table as a vector, using the instructions here File Geodatabase (*.gdb) support in QGIS?, but they are still separate from one another.
How do I connect the GeoTiff with the geodatabase so that I can visualize values from the geodatabase?