I want to do vertical datum conversions on geotiffs using NOAA vdatum The conversion status menu shows no progress and no conversion happens. I see that Microsoft Windows needs GDAL environmental variables set. 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?