How can I find my current GTK version using Terminal ? Is there a command for that ? I use 16.04 + Unity.
apt-cache policy libgtk2.0-0 libgtk-3-0 (optionally pipe to grep Installed)
apt-cache policy libgtk2.0-0 libgtk-3-0
or
dpkg -l libgtk2.0-0 libgtk-3-0