Wow, ever since I reinstalled Linux Mint the Gourmet program has been super borked. It looks like it's been superceded by a program calle Gourmand. Which is slightly less borked. At least it can read my recipe file, and do the meal scaling I need. But for editing or calculating the nutritional info I need, it's a no go.

The Windows version is still working, though, so ::fingers crossed::.