Run these two commands.
$ gsettings set org.gnome.metacity.theme type \'metacity\'
$ gsettings set org.gnome.metacity.theme name \'Clearlooks-Phenix\'
Run these two commands.
$ gsettings set org.gnome.metacity.theme type \'metacity\'
$ gsettings set org.gnome.metacity.theme name \'Clearlooks-Phenix\'