Currency VEF is not provided by IMF or ECB
$ gnome-calculator --version
gnome-calculator 3.28.2
$ gnome-calculator
** (gnome-calculator:27881): WARNING **: 23:09:16.933: currency.vala:412: Currency VEF is not provided by IMF or ECB
According to https://en.wikipedia.org/wiki/Venezuelan_bol%C3%ADvar (or more precisely, its sources), bolívar fuerte (VEF) has been replaced with bolívar soberano (VES) last month.