This can be used to change various Ubuntu/Gnome DE settings from terminal, for example changing shortcuts, similar to dconf.
gsettings list-recursively
gsettings get org.gnome.settings-daemon.plugins.media-keys window-screenshot
gsettings set org.gnome.settings-daemon.plugins.media-keys window-screenshot "['<Alt>8']"
gsettings reset org.gnome.settings-daemon.plugins.media-keys window-screenshot