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apt-get command

Debian / Ubuntu: Install gem The FrontEnd To Rubygems

How do I install rubygems package manager for Ruby on rails (RoR) under Debian or Ubuntu Linux operating systems?
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The Following Packages Were Automatically Installed And Are No Longer Required Warning

I have the following message whenever I use the apt-get command under Debian or Ubuntu Linux:

The following packages were automatically installed and are no longer required:
libaccess-bridge-java libjs-mochikit python-cheetah libjs-excanvas
libaccess-bridge-java-jni sabnzbdplus-theme-smpl tzdata-java
ca-certificates-java
Use ‘apt-get autoremove’ to remove them.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

How do I fix this issue? Is it safe to remove all unwanted packages?
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Debian Linux Install Eclipse Java / C / C++ IDE

How do I install Java and C/C++ integrated development environment called Eclipse under Debian GNU/Linux squeeze v6.xx?
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Linux: Jpeg Image Optimization / Compress Command

I know how to optimize and compress png images using optipng command. line tool. I have lots of images in JPEG format. How do I compress and optimize JPEG images on my amazon cloud account so that I can save bandwidth on cloudfront cdn account? How do I use an image compressor to create lossless compression on JPEG files, with no effect on image quality in bulk using Linux?
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Debian Linux Squeeze 6.0: Install Python v2.6/2.5 Argparse Module

I would like to use argparse module for Python 2.6 under Debian Linux. However, the code is not working. How do I install and use argparse Python module under Debian Linux 6.x for Python version 2.5 or 2.6?
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GCC: Linux gnu/stubs-32.h: No such file or directory

I have Debian / Ubuntu Linux. I need to compile software written in C. The gcc throwing an error that read as follows:

gnu/stubs-32.h: No such file or directory compilation terminated. make: *** [foo.o] Error 1

How do I fix this problem under Debian or Ubuntu Linux 64 bit system and compile apps using gcc compiler?
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Linux: See Bandwidth Usage Per Process With Nethogs Tool

I have Red Hat Enterprise Linux 6.x server. How do I find out and groups network bandwidth usage by process under Linux operating systems? How do I find out what programs are using network bandwidth under Linux operating systems? How can I see bandwidth usage per PID, command, and user on a Linux operating systems?
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Linux: Update All Packages Command

How do I update all installed packages on Linux operating systems? How do I perform upgrading packages through a network on Linux operating systems?
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Debian / Ubuntu Linux: Install GTK 2+ Development Environment

I recently installed Debian version 6.x on my Mac book pro. I wanted to write code in C/Gnome GTK and develop apps for fun and profit. How do I install C and Gnome gtk development environment under Debian or Ubuntu Linux operating systems?
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Ubuntu / Debian Linux Install ethtool Too To Display / Set Ethernet Device Settings

The ethtool can be used to query and change settings such as speed, auto- negotiation and checksum offload on many network devices, especially Ethernet devices. How do I install and use ethtool under Ubuntu or Debian Linux based system running on my IBM server?
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