Ubuntu 14.04: PPA key not found on keyserver

Running “apt-get update” ubuntu complains about missings ppa keys. In my case I was trying to install Libre Office and the missing key was 83FBA1751378B444. I couldn´t find any key running: sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 83FBA1751378B444 The message that I gog in the console was: gpg: requesting key 83FBA1751378B444 from hkp server keyserver.ubuntu.com […]

Convert audiofiles on Ubuntu by the command line with soundconverter

If you need to convert audio files in another format you can use the tool called “soundconverter”, that you can simply install: ~$ sudo apt-get install soundconverter Then simply run a command like: ~$ soundconverter -b -m “audio/mpeg” -s “.mp3″ /home/laura/cd-wav/*.wav “-b” stands for batch type “-m” to specify the mime format. “-s” to specify […]

Ubuntu 14.04 : launchpad.net NO_PUBKEY issue when running apt-get update

Launching sudo apt-get update you might get the NO_PUBKEY issue. Something like: W: GPG-Fehler: http://ppa.launchpad.net trusty Release: Die folgenden Signaturen konnten nicht überprüft werden, weil ihr öffentlicher Schlüssel nicht verfügbar ist: NO_PUBKEY EFD5FA852F20733F Well it´s very simple. Just execute the following (specifying the missing public key): [email protected]:~$ sudo apt-key adv –keyserver.ubuntu.com –recv-keys EFD5FA852F20733F And then […]

“Hello world” kernel module

Make a directory called “helloM” in your home dir and edit the following .C file, called “hello.c”: /*hello.c – The simplest kernel module.*/ #include <linux/module.h>  /* Needed by all modules */ #include <linux/kernel.h>  /* Needed for KERN_ALERT */ int init_module(void) { printk(“<1>Hello world 1.\n”); // A non 0 return means init_module failed; module can’t be […]

Linux file system

filesystem: the files and directories (or folders), the method used to store data on the hard drive (such as the ext3 filesystem. – Windows keeps all the important system files in a single directory C:\ – Linux follows the lead of its UNIX – Windows and Linux setups are both logical ✓ Linux uses a […]