Posts from 2010-04

Install Picasa (by Google)

add the following entry to /etc/apt/sources.list

# Google software repository
deb stable non-free main

or if you want to access newer software use the following lines ( ) :

# Google repository
deb <span...

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Virtualbox – Installing the NonFree Version on Ubuntu

sudo add-apt-repository "deb lucid non-free"
wget -q -O- | sudo apt-key add -
apt-get update
apt-get install virtualbox-3.1

solve problems with package signature

when running sudo apt-get update I got the following error:

W: A error occurred during the signature verification<span...

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HowTo generate secure passwords using pwgen

sudo aptitude install pwgen

pwgen can generate safe passwords for you. It is a command line tool and can be used like this:

pwgen -s -y 8 1

-s means create a secure password, -y means it should contain at least one special character, 8 means it...

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digiKam is a great software to manage your digital photographs. I like it especially because it does not depend that much on a database / proprietary ways to store information about the photos as it saves most information directly to the files.

sudo aptitude install digikam digikam-doc

To install...

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Ubuntu 10.04 lucid

set window operating buttons back to the right side

gconftool-2 -s /apps/metacity/general/button_layout --type=string "menu:minimize,maximize,close"

upgrade problems on Samsung Q25

but seems to be rather this issue:

boot with the -vesa video driver

other choice: use a newer Intel Video driver 2.11git:

upgrade xserver-xorg-video-intel to 2.11git

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Mount T-Online Mediencenter via WebDAV

This blog post describes how to mount the T-Online Mediencenter via WebDAV on Ubuntu Linux and on Windows 7 (64bit).


How To for Mac OS X

  1. Open Finder.
  2. Press [⌘]-[k].
  3. Connect to
  4. Enter email address and password.

How To for Ubuntu Linux

First, install the required package davfs2:


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Mount a GMail account as Filesystem using gmailfs

Warning: my experience with gmailfs was not excellent! It was a bit slow and you always risk to lose data you stored on that account.

based on IMAP:
(it used to be but this was based on the Webinterface and that changed often)

gmailfs works with FUSE....

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installation of povray itself:

sudo aptitude install povray povray-includes povray-examples povray-doc

as well as the graphical modeler:

sudo aptitude install kpovmodeler


A file created by POV-Ray:

General command line to render a scene (still has to be adopted for the file in question):


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conglomerate - an xml editor

sudo aptitude install conglomerate

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Install QlandkarteGT

sudo add-apt-repository ppa:mms-prodeia/ppa
sudo aptitude update
sudo aptitude install qlandkartegt

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Apply a Lowpass Filter to an mp3 Audio File

A lowpass filter can be applied using the command line tool sox. It tool can be installed like this on Ubuntu:

sudo aptitude install pacpl sox

Convert the audiofile to wave first (using Perl Audio Converter as sox has no mp3 support compiled in on Ubuntu systems):

pacpl --to...

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Software for the GenBank database


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Grub2: Permanently add `noapic` to the Boot Parameters

Edit the grub defaults file:

sudo gedit /etc/default/grub

and add noapic to GRUB_CMDLINE_LINUX_DEFAULT. Afterwards run sudo update-grub2 to recreate the list of boot entries (including the noapic option).



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Advanced Usage of ethtool

There exist a comparison of ethtool in linux with the equivalents in solaris command-by-command... It's great!

not available anymore... but here is an archived version:


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Generate a Hardware Profile

sudo lshw -html > hardwareprofile.html

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Create an Image of a Copy Protected Audio CD Using readom

use the option -clone!

readom dev=/dev/sr0 -clone f=audio-loops.iso

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Remove the 5% root quota of an ext2 / ext3 partition

Usually 5% of the storage of an ext2 or ext3 volume are reserved for the root user. You can use tune2fs to make that space available to other users!

tune2fs -m 0 /dev/sdb1

Only do this for non-system partitions (as you might need the "root quota" to recover from full...

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Set up a Samba Share for the KONICA MINOLTA magicolor 4690mf

This blog post documents the steps needed to set up a Samba Windows share on a Ubuntu based computer in order to let the Konica Minolta magicolor 4690mf scanner save scanned images directly to that folder.

Main resource: (German)

sudo aptitude install samba-common samba

You might also install the...

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GMapCatcher - an Offline Maps Viewer

update 2011-03: Google Maps is no longer supported.
GMapCatcher is an offline maps viewer. It downloads CloudMade, OpenStreetMap or Google Map tiles automatically, display them using a specific GUI. User can view the maps while offline.

get svn version

cd ~/Downloads
svn checkout gmapcatcher



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Install your own Wikidot Wiki


  • PostgreSQL 8.3
  • PHP 5.2+
  • Lighttpd 1.4 or 1.5
  • ImageMagick
  • LaTeX
  • PHP gd extension
  • PHP tidy extension
  • PEAR
  • file
  • git

To install all these:

sudo aptitude install postgresql-8.3 php5-cgi php5-cli php5-pgsql lighttpd imagemagick tetex-bin tetex-extra gs-gpl  php5-gd php5-tidy php-pear file git-core

Installation of Wikidot

cd ~/Downloads
sudo dpkg -i wikidot_0.90_all.deb

if it complains about missing packages...

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