Symptoms

The following message appears during the building stage of VirtualBox Guest Additions:
Building the VirtualBox Guest Additions kernel modules
The headers for the current running kernel were not found. If the following
module compilation fails then this could be the reason.

Solution

First check whether your system includes kernel headers matching your currently running kernel. For example:
# dpkg --get-selections | grep linux-headers
linux-headers-3.13.0-53                         install
linux-headers-3.13.0-53-generic                 install
linux-headers-generic                           install
# uname -r
3.13.0-53-generic

By default the root ssh login to Ubuntu 14.04 Linux server is disable. This is a security feature and even though you chnage the root password the root ssh login will be denied showing message similar to the one below:
$ ssh This email address is being protected from spambots. You need JavaScript enabled to view it.
	
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Permission denied, please try again.
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Permission denied, please try again.
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Permission denied (publickey,password).

In this config we are going to compile and install the Wesnoth 1.12 on Ubuntu 14.04 Linux. Battle for Wesnoth is a free single-player or multiplayer turn-based strategy game.
Let's get started by installation of all prerequisites:
# apt-get install cmake libsdl-image1.2-dev libboost1.55-all-dev libsdl-mixer1.2-dev libsdl-ttf2.0-dev libpango1.0-dev libsdl-net1.2-dev wget
Once the prerequisites are installed download Wesnoth's source code. For this we use wget:
$ wget -c http://downloads.sourceforge.net/project/wesnoth/wesnoth-1.12/wesnoth-1.12/wesnoth-1.12.tar.bz2

Introduction

FTP is a service known to almost anyone who works with Internet on daily basis. This guide will describe in detail how to setup an FTP server on Ubuntu Linux in simple to follow steps. We will show how to setup an FTP server in normal and stand-alone mode. We will also provide some security tips for your new FTP setup. This guide will use lightweight and efficient FTP server vsFTPd, which is designed to withstand on servers with high load.

Conventions

Occasionally in this article we will refer to vsFTPd simply as FTP server.

What is FTP

For those who are not familiar with FTP here is a short description of what this service offers. FTP stand for File Transfer Protocol. As the name suggest this network protocol allows you to transfer files or directories from one host to another over the network whether it is your LAN or Internet.

Main features of vsFTPd are: Virtual IP configurations, Virtual users, Standalone or inetd operation, Powerful per-user configurability, Bandwidth throttling, Per-source-IP configurability, Per-source-IP limits, IPv6 andEncryption support through SSL integration.

In this document we describe an installation of Puppet configuration manager on a Ubuntu Linux 14.04 Trusty Tahr. The installation will be followed by a simple puppet manifest example to make sure that installation was successful and puppet ready to use as standalone deployment.
First we need to inlcude puppet repository to our Ubuntu 14.04 Trusty Tahr Linux system:
$ wget http://apt.puppetlabs.com/puppetlabs-release-trusty.deb
$ sudo dpkg -i puppetlabs-release-trusty.deb 
$ sudo apt-get update
Now we are ready to install an appropriate puppet package which will fetch all necessary prerequisites requirements:
$ sudo apt-get install puppet
After a successful execution of the above command check the puppet version to get a first indication of working puppet manager on your system.
$ puppet --version
3.6.2
In the next step we are ready to test our Puppet installation with a simple puppet manifest file puppet-test.pp, which will do nothing else just create a file /tmp/puppet with a content: "Puppet installation, successful".
$ cat puppet-test.pp
file { '/tmp/puppet':
	content => "Puppet installation, successful",
}

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