Install libags-gui1 by entering the following commands in the terminal:
sudo apt update sudo apt install libags-gui1
Description:
Advanced Gtk+ Sequencer widget library
libags_gui is a widget library built upon Gtk+-2.0. It contains widgets like - LED - dial - indicator - cartesian - ruler
Homepage: https://nongnu.org/gsequencer
Version: 1.4.24-1ubuntu2
Section: universe/libs