Install gtkwave by entering the following commands in the terminal:
sudo apt update sudo apt install gtkwave
Description:
VCD (Value Change Dump) file waveform viewer
gtkwave is a viewer for VCD (Value Change Dump) files which are usually created by digital circuit simulators. (These files have no connection to video CDs!)
Homepage: http://gtkwave.sourceforge.net/
Version: 3.3.86-1
Section: universe/electronics