Install grfcodec by entering the following commands in the terminal:
sudo apt update sudo apt install grfcodec
Description:
suite of programs to modify Transport Tycoon Deluxe's GRF files
This package provides the grfcodec, grfdiff, grfmerge and nforenum commands which can be used to work with the GRF used by the Transport Tycoon Deluxe, TTDPatch and OpenTTD games.
Homepage: http://dev.openttdcoop.org/projects/grfcodec
Version: 6.0.6-1
Section: universe/devel