Problem Installing Themes

[Spyder]

To appear in the Theme tab of Appearance Preferences with its own big icon, a theme needs to be a Gnome Metatheme. Please see this older post for some explanation:

Help adding themes to Ubuntu Mate

To show in Apparance Preferences > Theme, like Ambiant-MATE and BlueMenta do, the theme has to be a Gnome Metatheme. Otherwise, it only shows under ‘Customize’ for an existing theme. A Gnome Metatheme consists of a GTK theme, Icon theme, window border theme and pointer. Each Gnome Metatheme has an index.theme file which specifies these things. You can modify the index.theme if you want. You can also make a Gnome Metatheme by adding a correct index.theme to an existing theme folder. Check an ex…

Click on link to see entire post!