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Using sources.list file
If you want to add repositories for ubuntu you need to add in /etc/apt/sources.list file before adding any new repositories take backup of this file and add more repositories.

#cp -p /etc/apt/sources.list /etc/apt/sources.list_backup

#vi /etc/apt/sources.list

Replace everything with the following lines

To use your local mirror you can add “cc.” before archive.ubuntu.com (cc = your country code)

e.g. deb http://lv.archive.ubuntu.com/ubuntu dapper main restricted universe multiverse

## Add comments (##) in front of any line to remove it from being checked.
## Use the following sources.list at your own risk.

deb http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse

## MAJOR BUG FIX UPDATES produced after the final release
deb http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse

## UBUNTU SECURITY UPDATES
deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse

## BACKPORTS REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.)
deb http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse

## PLF REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.)
deb http://packages.freecontrib.org/plf dapper free non-free
deb-src http://packages.freecontrib.org/plf dapper free non-free

## CANONICAL COMMERCIAL REPOSITORY (Hosted on Canonical servers, not Ubuntu
## servers. RealPlayer10, Opera and more to come.)
deb http://archive.canonical.com/ubuntu dapper-commercial main
Save the edited file
#apt-get update

If you want to generate youe own source list check here

Adding repositories Using Synaptic package management

go to System -> Administration -> Synaptic Package Manager

To enable the extra Universe and Multiverse repositories

Settings -> Repositories

In the Installation Media tab, click Add. There are three separate repositories; Dapper Drake, Security Updates and Updates. Select each repository and check Officially supported, Restricted copyright, Community maintained (Universe) and Non-free (Multiverse). Ensure you click OK between each repository to save your changes

You should now see those three repositories under Channels. Make sure Officially supported, Restricted copyright, Community maintained (Universe) and Non-free (Multiverse) appears under each repository

To add backports and PLF (new versions of many applications. Unsupported. May contain illegal packages. Use at own risk.)

Settings -> Repositories

Click on Add and then Custom

Paste the following four lines into the box and click Add Repository, one line at a time

deb http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse

deb http://packages.freecontrib.org/ubuntu/plf dapper free non-free
deb-src http://packages.freecontrib.org/ubuntu/plf dapper free non-free

deb http://archive.canonical.com/ubuntu dapper-commercial main

To refresh the list of known packages (equivalent to apt-get update)

Edit Menu -> Reload Package Information

To install all possible upgrades (equivalent to apt-get upgrade)

Edit Menu -> Mark All Upgrades… -> Default Upgrade

Edit Menu -> Apply Marked Changes

To search for a package (equivalent to apt-cache search package_name)

Edit Menu -> Search… Specify the package name

To install the selected package (equivalent to apt-get install package_name)

Select “package_name”

Package Menu -> Mark for Installation

Edit Menu -> Apply Marked Changes

To remove installed package (equivalent to apt-get remove package_name)

Select “package_name”

Package Menu -> Mark for Removal

Edit Menu -> Apply Marked Changes

Tags: adding ubuntu repositories, Package Management, Package Mgmt, synaptic ubuntu, ubuntu repositories