One question I get all the time is "What package is that file in?" There's a really easy way to find out yourself. It's called apt-file and it can search for a file in any package (installed or not). It's really easy to use:
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All the programs which you install using Synapatic package manger,apt-get,aptitude have a .Deb file in the following folder
If you are getting the following error when you try to install any packages use the following tip to fix this
Synaptic is a graphical user interface (GUI) for managing software packages on Debian-based distributions. If you are using Debian or Ubuntu you will easily find Synaptic in the System Tools menu or in the Administration menu. Synaptic uses the GTK graphic libraries . So, if you are using GNOME on your debian-based distro you will probably have Synaptic installed as well. Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+.