Install elpa-flycheck by entering the following commands in the terminal:
sudo apt update sudo apt install elpa-flycheck
Description:
modern on-the-fly syntax checking for Emacs
Flycheck uses various syntax checking and linting tools to automatically check the contents of buffers while the user types, and reports warnings and errors directly in the buffer, or in an optional error list. . It is intended to replace the older Flymake which is part of Emacs core.
Homepage: http://flycheck.org/
Version: 31-1
Section: universe/lisp