locale::facet::_S_create_c_locale Name Not Valid

If you get a license error message

 locale::facet::_S_create_c_locale name not valid

when trying to start VNL or ATK on Linux - and in particular Ubuntu 14.04 - you can solve it by adding the line export LANG=C either to your $HOME/.bashrc file, or the VNL and ATK startup scripts (the files “atkpython” and “vnl” in the bin directory in the installation are actually bash scripts).