Install bwidget by entering the following commands in the terminal:
sudo apt update sudo apt install bwidget
Extension widgets for Tcl/Tk
The BWidget toolkit is a high-level widget set for Tcl/Tk. It contains widgets such as progress bars, 3D separators, various manager widgets for top levels, frames, paned or scrolled windows, button boxes, notebooks or dialogs as well as composite widgets such as combo boxes, spin boxes and tree widgets. . The BWidget toolkit is completely written in Tcl so no compiled extension library is required.