Introduction
--------- Webmin is designed to allow the easy addition of new modules without changing any of the existing code. A module can be thought of
as something like a Photoshop plugin or iPhone application - it can be
written by someone other than the developers of Webmin and distributed
under a license the developer chooses.
A module should be written to administer one service or server, such
as the Unix password file or the Apache web server. Some complex
system functions may even be split over several modules - for example,
disk partitioning, mounting disks, and disk quota management are 3
separate modules in the standard Webmin distribution.
Modules can theoretically be written in any language. However, to make
use of the Webmin API Perl version 5.8 or above should be used. A
module should be written entirely in Perl, with no C functions or
external binary programs. The aim is for modules to be as portable as
possible across different Unix systems and CPU types.
Modules written in other languages will not be displayed using the
standard Webmin UI and will not be able to call its API. For these
reasons, using Perl is strongly recommended.
At their simplest, modules are really just directories of CGI programs
that Webmin's web server runs. However, there are certain rules that
should be followed to make sure that they work with the Webmin API,
main menu, and access control system. Even though you can just stick
any existing CGI script into a module directory, this is not a good
idea.
Required Files
Every module has its own directory under the Webmin base directory, in
which all the module's CGI programs and configuration files must be
stored. For example, if the Webmin base was /usr/libexec/webmin, a
module called foobar would be created or installed in
/usr/libexec/webmin/foobar.
You can find this base directory by looking at the root line in your
/etc/webmin/miniserv.conf file. It will differ depending on which
operating system Webmin is installed.
For a module to be displayed on the main Webmin menu, it should
contain at least the following files. Only module.info is mandatory
though.
module.info
This file contains information about the module and the operating systems it runs under. See below for details on its format.
images/icon.gif
The icon displayed on the main menu for this module. The icon should be 48x48 pixels and should use the same colour scheme as the
other icons on the main menu. lang/en
The text strings used by this module, as explained in the Internationalization section of this documentation. install_check.pl
Program that checks to see if the service or program is installed and usable, returning a non-zero value if so.
Each module name on Webmin's left menu is a link to the module
directory. Thus you must have an index.cgi file to be displayed when
the user clicks on the link. A typical module contains many .cgi
programs that are linked to from index.cgi, each of which performs
some function such as displaying a form or saving inputs from a form.
When you first create a new module, it will not be in the allowed list
of any Webmin user and so you will not be able to see it in the main
menu. To fix this, you must first delete the file
/etc/webmin/module.infos.cache to clear the cache of known modules.
Then to make your module visible, either edit the file
/etc/webmin/webmin.acl or use the Webmin Users module to grant
yourself access.
https://doxfer.webmin.com/Webmin/Module_Development
I found a guide to the webmin module installation and removal like you are trying:
https://www.smarthomebeginner.com/install-webmin-modules/
https://www.linode.com/docs/websites/cms/how-to-install-a-webmin-control-panel-and-modules/
and here:
Here is a module download page:
http://www.webmin.com/standard.html
here are all third party modules:
http://www.webmin.com/cgi-bin/search_third.cgi?modules=1
Use a prebuilt rpm or deb package:
The current Webmin distribution is available in various package formats for download from:
https://prdownloads.sourceforge.net/webadmin/webmin_1.910_all.deb 14.8 MB
http://webmin.com/download.html
If you want to use the apt command for deb files, use it like this:
sudo apt install path_to_deb_file
If you want to use dpkg command for installing deb packages, here’s how to do it:
sudo dpkg -i path_to_deb_file
In both commands, you should replace the path_to_deb_file with the path and name of the deb file you have downloaded.
From the github page:
Requirements
Perl 5.10 or higher. Installation
Webmin can be installed in two different ways:
By downloading a pre-built package, available for different distributions
(CentOS, Fedora, SuSE, Mandriva, Debian, Ubuntu, Solaris
and other) from our download page;
Note: It is highly recommended to
add repository to your system for having automatic updates.
By downloading, extracting source file, and running setup.sh script, with no
arguments, which will setup to run it directly from
this directory, or with a command-line argument, such as targeted
directory.
Note: If you are installing Webmin on Windows system, you
must run the command perl setup.pl instead. The Windows version
depends on several programs, and modules that may not be part of the
standard distribution. You will need process.exe commmand, sc.exe
command, and Win32::Daemon Perl module.
