Can any one hack Ubuntu Linux?

Technically yes, but it's difficult to do. Also remember that most Linux computers that are hacked are servers. Assuming you have a desktop, you should be very secure. Because your computer isn't going to be controlled remotely, it by default denies incoming connections like SSH. This means that no one, even if they know your password, can remotely control your computer. So you are relatively safe from online attacks. Note that it is possible for a script on a website to break out of your browser's sandbox, use a privilege escalation exploit, gain root access, and plant a rootkit, (basically pwn you completely), but this is VERY difficult and the average exploit for Linux is patched in two hours (or that's what I heard at least), so it'd take a really, really excellent hacker to do that, and a hacker at that level wouldn't be interested in your computer.

The other way a hacker could get into your computer is through malicious code that they trick you into downloading (aka malware). Linux is very safe from malware and hackers for many reasons:

1) All programs are by default not run as root, which means they can't change system files. You'd have to be a fool to run all your programs as root. ONLY run a program as root if you trust that it won't stab you in the back...

What is antivirus,widely used antiviruses,how to scan a pc and reviews of antivirus

What is a antivirus program:

Antivirus software is a computer program that detects,prevents and takes action to deactivate or remove malicious programs (Viruses,worms,adwares etc).
Antivirus program runs in background all the time and informs the user when some malware is detected.

Antivirus software protect computer connected to the network computers.
Some examples of antivirus software are:

• Symantec Antivirus software
• McAfee Antivirus software
• AVG Antivirus
• Kaspersky
• BitDefender
• Nod32

Widely Used Antivirus Software:

Everyday new viruses are spreading and infecting millions of computer across the world.For all computer users it is very important to have proper antivirus program installed in their  computers to secure the data and programs.

Following are some widely used antivirus programs.

Types of malware,how they harm your pc and how to remove them

Malware:

Malware programs are very malicious programs that harm your computer without your knowledge.There are many kinds of malwares.

Viruses:

A virus is a malicious computer program designed to harm your computer.It replicates itself. The ability of replicating, can affect your computer without your permission.It is a very common computer security threat.It is spreading in a very large quantity such as Email attachments,USB and downloading files from Facebook and from other websites.

Tips to prevent computer from hacking for free

Tips to prevent computer from hacking

The world has seen a lot of progress in last one century.The revolution in IT has made it possible to convey our messages from one place to another,with thousands of miles’ distance in between,within seconds.You can buy things online as well.But all these benefits have brought some risk with them.The risk of your computer being hacked.Every year,millions of PCs get hacked ,yet most of the users remain unaware that their PC has been hacked.Such unawareness and ignorance from the state of your PC can cause you to suffer from a heavy loss,even monetary loss if you are into online banking etc.In the following lines,I’ll be discussing a few tips about how to prevent your PC from being hacked.To protect your Computer from hackers just follow these steps given below.

1.You need to take out a few moments from your time and update your system whenever it tells you that updates are available because a system which is not updated regularly is more prone to hackers. 

4 best tips to protect your computer from hacking

In my previous posts I have said that "hacking is illegal". In this post I am going to show you "How to protect your computer from hacking". There are almost every people want to learn how to hack a computer.They search on Google, Bing and Yahoo etc.There they found many articles about how to hack a Computer etc.To protect your computer from hackers just follow my tips given below.

1.Keep your firewall on:

What is a firewall?

protect (a network or system) from unauthorized access with a firewall.

Does your computer has firewall?

In now days almost every computer has a firewall.

How to use firewall to protect from hackers?

 Always keep your firewall on.If your firewall is off many hackers can easily hack your computer.To turn on your firewall just follow the steps given below.