Install pdfsam by entering the following commands in the terminal:
sudo apt update sudo apt install pdfsam
Description:
PDF Split and Merge
PDF Split and Merge is a very simple, easy to use, free, open source utility to split and merge pdf files. It has a simple graphical interface to let the user choose pdf files, split or merge them.
Homepage: http://www.pdfsam.org
Version: 3.3.5-1
Section: universe/text