Guides | Linuxaria

How to recover from a failing Kernel

Apr 292011

Or perhaps i should call this “Do you remember i was upgrading to Ubuntu 11.04 ?”.

Well something is gone bad and when i rebooted to start my new Xubuntu 11.04 i got:

error: cannot read the Linux header.
error: you need to load the kernel first.

  Failed to boot both default and fallback entries.

Press any key to continue...

During the upgrade, Ubuntu has removed all old Kernel but one, and so..i find myself without a way to boot my machine.

Fortunately I did a lot of experience with Gentoo in the past, that on this occasion was very useful to recover the system.
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Check your disk usage with df and du

Guides 2 Responses »

Apr 262011

As system administrator , but also as common user on my PC, one of the more common problem is when a file system got filled up at up at 100% of its size.
So, in this article we’ll see 2 commands that can help us in keeping under control or check the space used in every filesystem and in his directory.

df : report file system disk space usage

du: estimate file space usage Continue reading »

Tesseract-ocr: convert scanned images into editable documents on Linux

Articles, Guides 11 Responses »

Apr 242011

Tesseract-ocr: how to convert scanned documents into editable text on Ubuntu or Debian, Original article by Gabriele published on Gmstyle (italian blog)

I learned from the requests come via email, that some of my readers use Ubuntu (or Linux in general) to work and deal with graphics and publishing, who for his profession and who as a hobby. I draw inspiration from the request of a dear member of this little web space, which has given to me the input for this article, to make a bit of clarity about a subject that,for what I’ve saw around during my research on the Internet, seems to have created some difficulties for many people.

The argument i’m talking about is the OCR technology (Optical Character Recognition), that is a “technology ” that can recognize text characters from an image of paper documents previously digitized through the scanner and then transform this into an editable text. Continue reading »

Gnome 2. Anonymous browsing with Tor

Guides 4 Responses »

Apr 212011

Gnome 2. Anonymous browsing with Tor By Francesco Di Leo.

I wanted to experience the thrill of browsing anonymously, or to a navigation system that does not easily reveal the information on the connection you use. The choice of which software to use is gone on Tor, but only because it is the most famous. Personally, I proceeded to download the latest version of TOR available for my GNU/Linux directly from its site.
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Fail2ban,stop brute force attacks

Guides 10 Responses »

Apr 192011

As comment of the article Knockd, to secure your ports, i’ve received:

“Port knocking is bad idea; a very bad idea.

Port knocking is, in the end, a password. A sniffable one that is subject to man-in-the-middle attacks so you can’t even use one-time-passwords and be secure.

Public/private key pairs and/or one-time-passwords (opie, skey and the like) are the real solutions, along with dynamic monitoring to prevent DOS CPU resource exhaustion attacks. (OpenBSD’s PF incorporates a nice solution, as does the iptables with fail2ban/denyhosts/etc. Even swatch can work wonders.)”

Well, in my opinion knockd it’s a layer of security, perhaps thin but still can save you from some brute force script and so it adds a bit of security to your solution, in this article i’ll show you fail2ban that add another layer of security to our network services.

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