command linemanpagesoftware-uninstall
After reading
How do I manually install a man page file?
(there is some ambiguity in this title) I did not get my answer.
How to install the related man pages for a certain command?
Take the command ls as an example, if the man page is not present, how can I install it?
It depends on the package. Emacs isn't packaged in a way that you can. For some packages you can apt-get install basepackage-doc.
First, find out which section your man page belongs to. If its a command, it probably belongs to section 1. You can read the manpage for the man command 
to see a description of the different sections and their corresponding numbers.
Copy your man page to /usr/local/share/man/man1/ (change 1 to your section number if need be). You can also install it to /usr/share/man/man1/, but it's best practise to use the local directory for files that are installed without using the APT package manager:
sudo cp examplecommand.1 /usr/local/share/man/man1/
Run the mandb command. This will update man's internal database:
sudo mandb
That's it! You should be able to view the man page by running:
man 1 examplecommand
man command mandb command /usr/bin/dh_installman if you can read Perl, installed with the debhelper package.
Best Answer
You don’t need to install
manpages manually, they are installed together with the command they describe. In the case oflsthe program as well as themanpage are part of thecoreutilspackage, see the package’s file list or the output ofdpkg -L coreutils:If the
manpage wasn’t installed properly for any reason, just reinstall the package:Though that is done automatically anytime a
manpage is added in the installation of a package, you can also update the database ofmanpages:If a command you seek help for is installed but has no
manpage, its help may be available elsewhere, see How can I get help on terminal commands? for alternatives.If you want to install a
manpage without the corresponding package I recommend usingdmanas explaned in this answer.