The following linux command procedure can be used to install Wine the Microsoft Windows Compatibility Layer (Binary Emulator and Library) on Ubuntu Linux amd64. If you are running 64bit Ubuntu Linux system in order to install Wine the i386 architecture needs to be enabled first. Otherwise any attempt to install Wine will result in:
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 wine : Depends: wine1.6 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

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.

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