Install libnetfilter-cthelper0 by entering the following commands in the terminal:
sudo apt update sudo apt install libnetfilter-cthelper0
Description:
userspace-helper for netfilter library
libnetfilter_cthelper is the userspace library that provides the programming interface to the user-space helper infrastructure available since Linux kernel 3.6. With this library, you register, configure, enable and disable user-space helpers.
Version: 1.0.0-1ubuntu1
Section: universe/libs