Can't use metacity themes in gnome flashback session (metacity) Ubuntu 16.04
You can use GSettings to change theme:gsettings set org.gnome.metacity theme THEME_NAME
Above will work with Metacity 3.16.x and 3.18.x, but starting with 3.20 Metacity by default will use GTK+ theme. To use Metacity themes you will need to change two settings:
- gsettings set org.gnome.metacity.theme type metacity
- gsettings set org.gnome.metacity.theme name THEME_NAME
Available types are metacity and gtk. When using gtk type Metacity will ignore THEME_NAME and will use GTK+ theme.