To check your current and previous runlevel use runlevel command:
# runlevel 
N 2
From the above command output we can see that there was no previous runlevel detected and current run level is 2. Runlevel list defined by the Ubuntu Linux:
  • 1 - Single
  • 2,3,4,5 - User defined runlevels. Default 2
  • 6 - Reboot

This article will describe an USB-Creator installation procedure on Ubuntu Linux. USB-Creator allows you to create a bootable USB key from Ubuntu CD or ISO image. First, we need to install all pre-requisites in order to build USB-Creator package. Once we have successfully build USB-creator packages we use dpkg command to install all USB-Creator on the system.

Let's start by pre-requisites installation:
# apt-get update
# apt-get install bzr pbuilder debhelper dh-translations python3-distutils-extra pkg-kde-tools
Now download a current development code from "brz" revision control system:
# bzr branch lp:usb-creator usb-creator.trunk
Navigate to USB-Creator's source code directory:
# cd usb-creator.trunk/

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).

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