Install libgmtk1 by entering the following commands in the terminal:
sudo apt update sudo apt install libgmtk1
Description:
gnome-mplayer toolkit (shared library)
A set of GTK+ widgets used by gnome-mplayer. It provides, amongst others, gnome-mplayer's media player widget. . This package provides the shared library.
Homepage: http://code.google.com/p/gmtk/
Version: 1.0.9-2ubuntu1
Section: universe/libs