I'm trying to install for instance this plugin in gedit on Linux Mint 12 (Gnome 3). The gedit version is 3.2.3. According to the Gnome gedit plugins page, the following must hold for third party plugins:
To install one of these, you need to download the files and put them in your ~/.local/share/gedit/plugins/ directory (which may need to be created). They need to be in that exact directory; subdirectories are not scanned for plugins.
I have done exactly that, but no third-party plugin will appear in the plugins list. Does anyone have any advice? It would be very helpful.