Install elpa-fill-column-indicator by entering the following commands in the terminal:
sudo apt update sudo apt install elpa-fill-column-indicator
Description:
graphically indicate the fill column
Many modern editors and IDEs can graphically indicate the location of the fill column by drawing a thin line (in design parlance, a `rule') down the length of the editing window. Fill-column-indicator implements this facility in Emacs.
Homepage: https://github.com/alpaker/Fill-Column-Indicator
Version: 1.90-1
Section: universe/lisp