How to install CLISP and Maxima on Ubuntu
godarda@gd:~$ su
Password: 
root@gd:/home/godarda# apt install clisp
...
root@gd:/home/godarda# clisp --version
GNU CLISP 2.49.93+ (2018-02-18) (built on lcy02-amd64-009.buildd [127.0.1.1])
Software: GNU C 13.2.0 

root@gd:/home/godarda# apt install maxima
...
root@gd:/home/godarda# maxima --version
Maxima 5.46.0