Install freebsd-manpages by entering the following commands in the terminal:
sudo apt update sudo apt install freebsd-manpages
Description:
Manual pages for a GNU/kFreeBSD system
This package contains a selection of manual pages from FreeBSD that are useful on a GNU/kFreeBSD system: 2 = System calls (functions provided by the kernel) 4 = Special files (usually found in /dev) 9 = Kernel routines
Homepage: https://www.freebsd.org/docproj/
Version: 11.1-3
Section: universe/doc