Install vttest by entering the following commands in the terminal:
sudo apt update sudo apt install vttest
Description:
tool for testing VT100 compatibility of terminals
This package provides a program designed to test the functionality of a VT100 terminal (or emulator). It also supports analysis of VT220, VT420, and xterm. . The program is menu-driven and contains full on-line operating instructions. It tests both display (escape sequence) and keyboard handling.
Homepage: http://invisible-island.net/vttest/
Version: 2.7+20140305-3
Section: universe/utils