@ggc Maybe you should try appimages, which are kind of a flatpak thing. Super easy to run: download it, make it executable and that’s all. (not sure if they run on Windows, and you don’t need to upgrade do 18.04)
Here’s the link to where you have the latest Gimp bundled with lots of plugins, G’mic included. Look for the latest date (as of now, it’s the 2018-05-17 one). I’ve been using these images and, although it’s a beta version (I guess), it’s the latest and greatest and it’s very stable.
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