Ubuntu virus effect

Asked by Sukhendu Ghosal

This is a question corresponding to this video


In this video it is shown that the viruses can easyly destroy my system. I am a regular user. I dont know even how to configure firewall & antivirus. Some post here and from some internet search I found that it is necessary to set up firewall in ubunu. So how can I make my system secure from virus ,malware or spyware? Need some suggession .

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Mark Rijckenberg (markrijckenberg) said :

That link you sent us is coming from a very dubious source.

Here is a much more reliable source of information:




I have never had any malware, virii, spyware of trojans attack my Linux computers and I have been using Linux since 1998...

Best advice is to use a strong password (longer than 10 characters, using capitals, small letters, numbers and special characters) in all your online and offline user accounts. The weakest link in security is often the use of weak passwords.

Do not install anything that is not coming from signed Ubuntu repositories, if you want more security.

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Jeet (gour-jitendrasingh) said :

me too never had any malware in my Linux i am using it since 2010 and off-curse i use internet and gmail etc etc on huge basis


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Sukhendu Ghosal (sukhendughosal) said :

@ Mark Rijckenberg (markrijckenberg)

How to sure that a software is coming from signed ubuntu repositories or not ? I have installed all from ubuntu software centre. Only skype and google talk plugin are from deb file. thanks

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Mark Rijckenberg (markrijckenberg) said :

@Sukhendu: please read this:


and this:


So if you run the following command

sudo apt-get update

and you get an error like this:

W: GPG error: http://security.ubuntu.com oneiric-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

then you know that the signature for that repository is invalid.

If there are no errors or warnings, when running

sudo apt-get update

then there are no signature issues with the repositories defined in your /etc/apt/sources.list file.

It is NOT recommended and more dangerous to download .deb files from the Internet, because there is no signature or hash checking when downloading a .deb file. So it could be coming from a malicious hacker instead of a trusted, signed Ubuntu repository.

Maybe someone else can give more insight into this....

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