How to add CD/DVD entry into Debian Linux source.list file

In Debian based linux(deb package management system) Linux "/etc/apt/sources.list" is the file which tells your linux box where the repository.  Regardless of the new packages installation mode (whether via terminal with apt-get command or with synaptic package manager) this file is referenced to fetch the needed .deb files.  For this method you need to have a good internet connection.

If you have installation CD/DVD you can add this to the source.list file and use that as your repository(only to install the packages available in the CD/DVD).  how to do that?

[What apt tool actually needs is a catalog file to use (packages.gz) and the original .deb packages.  As the installation CD/DVD contains it we can use the same as like online repo.]

1. Insert your CD/DVD into the drive and ensure it is mounted properly

2. Go to terminal by
Applications -> Accessories -> Terminal (Steps for BOSS GNU/Linux)

3. Type the following command

$sudo apt-cdrom add

This command will add the cdrom entry into the /etc/apt/sources.list.

4. Now update your apt file with the following command

$sudo apt-get update

5. Install the packages you need by

$sudo apt-get install

How to generate package download script using synaptic?

This post describes how to install linux (.deb)packages into a linux machine which have no/low speed internet connection[In linux one should have a good internet connection to get connected to repository to install any new packages].  Ofcourse this will be achieved only through a another linux machine(of same distro&same version unless you know how to modify /etc/apt/sources.list and update the linux machine) that has good internet connection like your Relative's/friend's machine or a linux box in browsing center etc.  I am explaining the following thing with BOSS GNU/Linux 4.0(savir version name).

We can achieve the installation of a package into a machine with low/no internet connection

Method 1:

1. The machine in which you want to install  go  System -> Adminstration -> Synaptic Package Manager

2. Select the package which you want to install.  

 Note: Synaptic itself selects all the other dependency packages that are needed to install the package you selected.  You can see a green color tick mark, those packages are going to be installed

3. Now click on File -> Generate Download script, give a file name for the script and select path to save it.

4. Keep the resultant file with you & execute that shell script file in a machine which have the internet connection, it will downloads all the packages(.deb files) that are needed to install the packages you selected.  

5. Copy all those files to your linux machine and install through terminal as follows

$cd /path_to/deb_files/directory

$sudo dpkg -i *.deb

6. Now the packages is installed successfully thats all.

Method 2:

Another way, is install the package which have a good internet connection and copy the .deb files downloaded for that installation, use it in your system

1. First clean the archives directory

$sudo apt-get clean

2. Install the package which you want using

$sudo apt-get install <package_name>

3. copy all the .deb files from the /var/cache/apt/archives directory to your removable media(pendrive)

$mkdir /media/<your_perndrive_moutn_point>/deb_directory

$sudo cp /var/cache/apt/archives/*.deb /media/<your_perndrive_moutn_point>/deb_directory

4. Insert the pendrive in your machine and do the following

$cd /media/your_pendrive_mount_point/deb_directory

$sudo dpkg -i *.deb

Thats all the packages are installed in your machine...  This two methods are useful when you try to install huge packages like office, gimp, blender etc...

any how Methode 1 is best one as it creates the script to download the .deb packages that actually is needed to install into your machine, and it doesn't install only downloads.  

When a new package installed.., What are the files installed & where they are?

In Debian linux(which uses apt-get & dpkg for package mangement) we can find out what are the files
get installed when a new package installed into your system. There are two ways to do this.

GUI Way:
System -> Administration -> Synaptic Package Manager
1. Now you got a GUI window. In that window on left side select "status" button & then "Installed"
2. Now you will see all the installed packages in your system on the right side.
3. Select the package to which you want to get the information, then right click select "properties"
4. Now you will get a new window with tabs "common, dependencies, installed files.. etc". Click the installed files tab.

Now you can see all the files installed in your system regarding that particular package with the full path to those files. :)

CUI Way(Terminal):
Issue the following command in terminal
#dpkg -L "packagename" | more
Note: Replace with the package which you want without quotes. I am using the debian derived Indian linux distro "BOSS- Bharat Operating System Solutions"



This will be useful when you are not sure/know where the configuration, log files, command regarding particular package is.

Want to install "codec" for multimedia applications automatically?

In Linux some may face that some of their songs, videos(different formats) are not playing. So one need to install the corresponding plugins, codecs.
So what if when we try to play a song, video of new format the player itself findout the corresponding plugins and install by itself(Assumed you have internet conenction).

For this there is one package application called "gnome-codec-install" [Mostly it preinstalled in your Linux OS(Debian/Debian derived)]. If not installed prior. Just install it using

1. System -> Administration -> synaptic manager then serarch the package name and install.

2.In terminal $sudo apt-get install gnome-codec-install

So after successful installation when you try to play a song, video whose codec not installed yet will automaticall connect to the repository and installs then play.