I want to do vertical datum conversions on geotiffs using [NOAA vdatum][1] The conversion status menu shows no progress and no conversion happens. I see that [Microsoft Windows needs GDAL environmental variables set][2]. The Windows paths are... C:\Program Files\GDAL C:\Program Files\GDAL\bin C:\Program Files\GDAL\bin\gdal\apps C:\Program Files\GDAL\bin\gdal-data C:\Program Files\GDAL\bin\gdal\plugins I am running Linux Ubuntu 16.04 with GDAL installed. Do I need to set the environmental variables for Linux? If so, I understand how to set paths (sudo -H gedit /etc/environment). What would the paths be for Linux? [1]: https://vdatum.noaa.gov/welcome.html [2]: https://vdatum.noaa.gov/docs/userguide.html