Install cl-trivial-garbage by entering the following commands in the terminal:
sudo apt update sudo apt install cl-trivial-garbage
Description:
Portable GC-related APIs for Common Lisp
trivial-garbage provides a portable API to finalizers, weak hash-tables and weak pointers on all major implementations of the Common Lisp programming language.
Homepage: http://common-lisp.net/project/trivial-garbage/
Version: 20150113-1
Section: universe/lisp