I get the error "<Rcpp::exception in CPL_geos_nearest_feature(st_geometry(x), st_geometry(y)): GEOS version 3.6.1 required for selecting nearest features>"
Found how to install GEOS from source here. Turns out I didn't have the new GEOS version in my sources list: https://grasswiki.osgeo.org/wiki/Compile_and_Install_Ubuntu#GEOS