Installing packages (programs):
-------------------------------

There are 3(4) manners to install packages (programs) on an Ubuntu machine:
	a) Install using the package manager "apt" or "apt-get"
	b) Download the source code for a package, then build it
	c) Use the (old) package manager "dpkg"
Al of them are described below through examples.

1) Install using "apt"
	sudo apt install <package_name>

e.g.
	sudo apt install bison
	
	
2) Search for a package (name or string from the description)

	sudo apt search ncurses
	
3) Remove a package
	sudo apt remove bison
	
4) Update the package list and then upgrade all
	sudo apt update
	sudo apt upgrade -y
	
5) Add a repository (an example)
	sudo add-apt-repository "deb [arch=amd64] http://download.webmin.com/download/repository sarge contrib"

This example add the repository where webmin is located, after that we can use 
it to install software from there. In this case the webmin package.
It is only one of the steps from webmin installation as we saw in 
	linux4-part4-Ubuntu.txt

6) Install using Debian package manager (an example)

First you need to download the file (.deb file)
Then, if we have it in the current folder:
	dpkg -i flashpluginnonfree_2.8.2+squeeze1_i386.deb

Of course this will install the flashpluginnonfree_2* file 

7) Install from sources steps:

	- download the package (program) sources
	- unzip and untar them with tar -xvf <package-file-name.tar.xz>
	the xz extension might be another one, e.g. bz2, gz, zip, ...
	- go to the obtained folder (with the cd command)
	- read the README file
	- follow the  instructions from that file.

An example of how to do that is detailed in the file 
	linux11-kernel-en.txt