Category Archives: Linux

How-To fix the GPG error: “The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY”

These are the few command-line instruction to fix the GPG Error (NO_PUBKEY) that may appear when trying to run the ‘apt-get update’ command on a APT based system: “GPG error: http://some.site.com stable Release: The following signatures couldn’t be verified because the public … Continue reading

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Download: (History of) Free Software Foundation In A Nutshell

Here there are the PDF, MP3, M4B (audiobook) and iBooks versions of ‘Free Software Foundation In A Nutshell’ mp3: Free Software Foundation In A Nutshell m4b: Free Software Foundation In A Nutshell pdf: Free Software Foundation In A Nutshell ibooks: Free Software Foundation In … Continue reading

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How-To Configure Wireless LAN on RaspberryPi With Raspbian Kernel 3.2.27+ And Solwise RTL8188CUS WiFi dongle

The configuration of WLAN with a RTL8188CUS dongle on RaspberryPi is quite trivial now. It doesn’t’ rely on esoteric scripts, of manual installation of third-party kernel modules anymore. I’ve been digging the solution for days before, it came alone at the … Continue reading

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How-To Fix: “regenerate_ssh_host_keys …failed” on Raspbian for RaspberryPi

Listen to me! download mp3 During your RPi boot it may happen that you get an error message like, “regenerate_ssh_host_keys …failed”, such error is generally sign that you SSH service won’t start. That issue showed to me during the second … Continue reading

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How-To Redirect PATHINFO (Almost Pretty) Permalinks To Pretty Permalinks

This post is about supporting your former PATHINFO Permalinks structure (a.k.a. Almost-Pretty-Permalinks), on your new web-site using Pretty-Permalinks. Redirect 301 /index.php/ http://www.yoursite.com/ RewriteRule . /index.php [L] These are the lines of Apache’s configuration that must be present in the website’s main .htaccess … Continue reading

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How-To Send A Command In Background And Keep It Running using ‘nohup’

The shell command ‘nohup‘ in combination with ‘&‘ will allow to send the a command-line instruction in background enabling the process to keep running after the user who issues the command has logged out. A common use of ‘nohup’ is when … Continue reading

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How the UNIX system Load Avarage is calculated on Mac OS X and Linux

The Load Avarage values that are shown using the ‘top’ commad or the ‘uptime’ command represent the number of blocking processes in the run queue averaged over a certain time period. An example fo HIGH Load Avarage: load average: 12.54, … Continue reading

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How-To user EtherApe graphical network monitor with Windows, Mac OS X or Linux

EtherApe is a graphical network monitor for Unix that come with most of the GNU/Linux distrubution but is not, now is present in MacPorts for Mac OS X and but has no porting for Windows as well. The best use … Continue reading

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How-To flush the DHCP server lease cache

To flush a DHCP server delete the files dhcpd.leases and dhcpd.leases~ Continue reading

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