Install latex209-bin by entering the following commands in the terminal:
sudo apt update sudo apt install latex209-bin
Description:
latex209 command for LaTeX 2.09 25-mar-1992 version
LaTeX 2.09 is obsolete. Use LaTeX 2e. This package is for those who want to use old style files.
Version: 25.mar.1992-17
Section: universe/tex