$ sudo apt-get update
$ sudo apt-get install libnetfilter-cttimeout1 

libnetfilter-cttimeout1 is installed in your system.

Make ensure the libnetfilter-cttimeout1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libnetfilter-cttimeout1 *

You will get with libnetfilter-cttimeout1 package name, version, architecture and description in a table

libnetfilter-cttimeout1 package basic information: