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package management tool

HowTo: Upgrade Debian 5.0 (Lenny) To Debian 6.0 (Squeeze)

Debian 6.0 "Squeeze" has been released and how do I upgrade to Debian GNU/Linux 6.0 from the previous release, Debian GNU/Linux 5.0 ("Lenny") using command prompt?
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Ubuntu Linux: Uninstall / Remove Any Installed Software

Q. I'd like to save some disk space so I'd like to remove unwanted software from my HP laptop. How do I uninstall software under Ubuntu / Debian Linux?

A. Both Ubuntu and Debian Linux provide command line as well as GUI tools to delete / remove binary packages.

GUI Package Management Tool

synaptic is graphical management tool of software packages. It allows you to perform all actions of the command line tool apt-get in a graphical environment. This includes installing, upgrading, downgrading and removing of single packages or even upgrading your whole system.

Just click on System > Administration > Synaptic Package Manager

Now you can select any package and click on Mark for Removal popup meni. You can also start GUI tool from command line, enter:
$ synaptic &

Command Line Package Management Tool

apt-get is the command-line tool for handling packages. It is used for adding / removing / updating packages.

Uninstall / Delete / Remove Package

Just use the following syntax:
sudo apt-get remove {package-name}

For example remove package called mplayer, enter:
$ sudo apt-get remove mplayer

Remove package called lighttpd along with all configuration files, enter:
$ sudo apt-get --purge remove lighttpd

To list all installed package, enter:\
dpkg --list
dpkg --list | less
dpkg --list | grep -i 'http'