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