Root doesn't exist?

Linux, Ubuntu, 2015-06-16 23:41:30 UTC
I recently got a problem after installing Ubuntu 12.04. The problem is, I can't switch into root by typing su command. As I remember in installation, there was no configuration about root. It was only configuration about a user. After searching around, I came into a solution. Just type command below
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Changing the computer name on Ubuntu

Linux, Ubuntu, 2015-06-16 23:36:06 UTC
To change the computer name in Ubuntu, follow these steps; 1. Open /etc/hostname you@computer:~$ sudo nano /etc/hostname And give the name you want (in /etc/hostname); ubuntu-RV 2. Open /etc/hosts you@computer:~$ sudo nano /etc/hosts And change the name as you type above; 127.0.
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Creating single pdf from images

Utilities, Linux, Ubuntu, 2015-06-16 23:27:31 UTC
It is difficult to make a number of images into single pdf file. With manual method, usually you must copy into a word processing application and convert into a pdf. But with ImageMagic, you can do it with just single line command. First, you need to install ImageMagic; $ sudo apt-get install ima
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Step by step Ubuntu Uncomplicated Firewall configuration

Linux, Ubuntu, 2015-06-16 23:26:20 UTC
Firewall is a network security system that controls the incoming and outgoing network traffic based on an applied rule set.(Wikipedia) By default, Ubuntu includes Uncomplicated firewall (UFW) in the package but not activated. So, in this article, I will guide you step by step configuring it; 1. Checking UFW status # ufw status or # ufw status verbose Checking raw status # ufw show raw 2. Activating UFW # ufw enable
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Step by step installing VNC Server on Ubuntu 14.04

Linux, Ubuntu, 2015-06-16 23:24:50 UTC
Server side 1. Update Ubuntu $ sudo apt-get update $ sudo apt-get dist-upgrade 2. Install some package; Gnome, XFCE, Firefox and Nano $ sudo apt-get install gnome-core xfce4 firefox nano 3. Installing VNC Server $ sudo apt-get install vnc4server 4. Run VNC Server for the first time $ vncserver You will require a password to access your desktops.
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Installing .sh file

Linux, Ubuntu, 2015-06-16 23:17:28 UTC
1. Modify the file so it is executable $ chmod +x <installer-file-name> </installer-file-name> 2. Executing the file $ ./<installer-file-name><installer-file-name> </installer-file-name> or $ sh <installer-file-name><installer-file-name> </installer-file-name>
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Prevent users sign in via SSH

Linux, Ubuntu, 2015-06-16 23:05:03 UTC
By default, Linux bundled with SSH. On a server with a Linux OS, may have had hundreds of users. By default, these users can log in via SSH. Each user has different levels of knowledge of the security features on this Linux. Carelessness of a user can be bad to the server. If an intruder sign in via SSH, this can be very dangerous. Can be ascertained, intruder can perform any activity with ease through this SSH. In this tutorial I will explain how to prevent certain users in through SSH. In general, ssh cofig stored in / etc / ssh / sshd_config In order to prevent users from entering via SSH, type the following command; $ sudo nano / etc / ssh / sshd_config
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