In linux the gmic configuration/data files are kept in ~/.config/gmic
In there is a file gimp_filters which if you updated will look like this
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /gimp_filters.txt was not found on this server.</p>
</body></html>
So that file no longer exists.
You can get "a version" dated 2015 which will give some search facility although some might be missing/wrong place.
https://github.com/jpfleury/gmic-filter ... ilters.txtcopy that as gimp_filters (no .txt) to ~/.config/gmic and a search in gmic 1.7.9 looks like this
As a note, both gmic 1.7.9 and gmic 2.0 can co-exist in Gimp.
Keep your existing plugin gmic_gimp in your plug-ins folder ~/.gimp-2.8/plug-ins
Worth trying the QT version of gmic, so put gmic_gimp_qt in the plugins folder as well.
Both appear bottom of the filters menu. A search with version 2 looks like this: