Fire up a terminal:
Install Emacs (IDE):
sudo apt-get install emacs
Install SBCL (Compiler):
sudo apt-get install sbcl
Install Quicklisp (Quicklisp is a library manager for Common Lisp.)
This is done by copy-and-pasting all bold commands in the grey box here: https://www.quicklisp.org/
Install SLIME by using Quicklisp: In the terminal run SBCL:
sbcl
(ql:quickload "quicklisp-slime-helper")
(quit)
SBCL will warn you about having to edit your ~/.emacs file. Do not ignore it
Now inside Emacs to start SLIME type:
M-x slime
Which is Alt+x slime.
Now you're ready to play with LISP.