How to Install Firefox 80 on Linux Mint, Ubuntu, Debian, CentOS, Fedora…

… or any other Linux distribution. This how-to explains how to install Firefox 80 on Linux, with or without replacing an existing Firefox installation. Firefox 80 was officially released on August 25, 2020. Firefox 81 will be released on September 22, 2020. More information on Firefox release dates (including beta, nightly and ESR versions) can […]

LibreOffice install - Logo with Libreoffice official Font and Document Foundation caption

How to install LibreOffice 6.4 on Linux Mint, Ubuntu, Xubuntu, Debian…

This article describes how to install LibreOffice 6.4 on Debian/Ubuntu-based Linux distributions, such as Linux Mint, Xubuntu, Kubuntu, Debian and Ubuntu. This installation method is based on the official .deb packages. LibreOffice 6.4 was released on January 29, 2020 LibreOffice 7.0 (ex 6.5) is scheduled to be released in the 32nd week of 2020, between […]

AVIF browser test page: AVIF support in Chrome, Firefox, Edge…

Is your browser capable of displaying AVIF images? Here comes a fast answer using a <picture> tag. If your browser can display AVIF files, it will. Else a fallback JPEG picture will be used: Summary • Which browsers are capable of displaying AVIF pictures? • AVIF test pictures • How to convert images to the AVIF file format […]

How to remove TLSv1.0 / 1.1 and enable TLS 1.3 in Nginx …

… on Ubuntu 18.04 or 20.04 In January 2020, SSL Labs started to downgrade ratings for websites still using TLS 1.0 and TLS 1.1 Protocols. In this tutorial we will: Disable TLSv1.0 and TLSv1.1 and enable TLSv1.3, Enable HTTP/2 if it still isn’t, Improve Nginx security. These changes should not affect servers using Let’s Encrypt […]

How to Sync Fonts Between Linux Devices

This small guide is about syncing fonts between two or more Linux devices, for example one laptop and one desktop computer, both running any Linux distribution. More specifically, I use this method to sync fonts I downloaded via the Google Fonts library. Is it possible to sync fonts on any Linux distribution? The method chosen […]

How to insert Google Charts in Wordpress

How to insert Google Charts in WordPress

Inserting charts in WordPress posts or pages is not so easy it could be. There are indeed some plugins to simplify your life, but they are mostly not up to date or somewhat not satisfying: ChartBoot for WordPress is the best solution to date, definitely worth trying and using, but is still limiting in some […]

Interactive charts how-to – NVD3, charts.js and Google Cahrts in Wordpress

Google Charts vs NVD3 vs Chart.js – Part 2

Here is the second part of my search of the best free-to-use charting library. Part 1 was a comparison of horizontal bar charts rendered with Google Charts and NVD3 (Chart.js doesn’t support horizontal bar charts). Example 2: line chart The second example is a line chart featuring the growth of the Netherlands-based ethical bank Triodos […]

How to insert Google charts, NVD3 and charts.js

Google Charts vs NVD3 vs Chart.js – Part 1

A few days ago I wrote a post on how to add Google Charts in WordPress. The method I describe can also be used to insert NVD3 or Chart.js graphics. As I’m starting a new website on ethical banking, I’m trying to find the best charting library for my basic needs. Let’s take a look […]

Vantage WordPress Theme – Remove the footer

If you run the Vantage theme on WordPress, you’ll notice the “A SiteOrigin Theme” footer. If you want to get rid of it, remove it, delete it, here is how to do it. First, create a child theme. In your newly created styles.css, add the following lines: #colophon #theme-attribution { display: none; } Reload your […]

WordPress: remove links to images

WordPress default settings are somewhat awkward: if you insert an image (or any picture or media) in a post, the inserted image will link to itself. A visitor who reads your post will see a “hand pointer” when his mouse pointer goes over the image, and he may want to click on the image. The […]

Twenty Fifteen WP theme: the right way to remove post dates and author

If you’re trying to remove the post dates and author in WordPress Twenty Fifteen theme, you could just add the following code to the style.css file of your child theme: .entry-footer { display:none !important; } An awful lot of WordPress forums show an excessive use of this CSS trick. It works perfectly, except for one […]

How to add a new domain/website to a WordPress network (multisite)

In this post you’ll find how to add a new site with a new domain name to your existing WordPress network (aka multi-site installation). What you want: Add a new site to your WordPress network – your new site has its own domain name. What you need: A working WP Multisite installation. If you didn’t […]

How to set up automatic updates on Ubuntu Server 18.04

This guide explains how to configure automatic updates in Ubuntu Server 18.04 “Bionic Beaver”. This tutorial is based on the following official Ubuntu Documentation article: Ubuntu Server Guide » Package Management » Automatic Updates Step 1: package installation Install the unattended-upgrades package: sudo apt install unattended-upgrades This package may already be installed on your server. Step […]

How to install a LEMP stack on Ubuntu 18.04

Introduction This guide shows how to get a full LEMP software stack installed on Ubuntu 18.04. The LEMP stack can later be used to set up a CMS like WordPress, Joomla or Drupal. There are tons of tutorials on this subject. The goal of this particular one is to be the most comprehensive and best […]

Ubuntu: resolve the “perl: warning: Setting locale failed” problem

Are you running Ubuntu 14.04 or 16.04 desktop or server edition, and getting warning or errors when installing software via apt-get or aptitiude? Here is a typical error message: perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_TIME = “es_ES.UTF-8”, LC_MONETARY = “de_DE.UTF-8”, LC_ADDRESS […]

XMind doesn’t start on Linux (Eclipse Error)

Problem: After a crash on Linux Mint, the mind mapping program XMind would not start. When executing XMind, the program displays a dialog with the following error message: An error has occurred. See the log file ~/Desktop/configuration/[numbers].log The .log file is as follows: !SESSION 2016-12-13 09:35:51.394 ———————————————– eclipse.buildId=R3.7.0.201611010032 java.version=1.8.0_111 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, […]

How to edit metadata via the command line with ExifTool

In a previous post, I tried to find a metadata editor with a graphical user interface on Linux. The best solution, DigiKam, is designed for KDE. The second best option, XnView, is perfectible and not free software. As a Linux Mint (Cinnamon) user, I ended up thinking that it would be better to use a […]

How to edit image metadata on Linux

Image metadata is a complex field with multiple standards, the most important among them being Exif, IPTC-IIM and XMP. In this guide I try to find a solution to edit (read, modify, remove) image metadata (jpg, png, …) on Linux, if possible with a graphical user interface (GUI). Many photo editors and image manipulation programs […]

The Fairphone 2, Free Software and alternative operating systems

The Fairphone 2 is made by a certified B-Corporation based in Amsterdam, The Netherlands.  The Fairphone 2 is probably the world’s fairest and greenest piece of advanced consumer electronics. Here is why the Fairphone should matter to anyone interested in Free Software. Table of Content: Is the Fairphone 2 the freest phone available? The Sailfish […]

Backup Scheduler, the only really free multisite-compatible plugin in the wild!

Free backup plugins for WordPress Multisite

This post is about free backup plugins for Wordpress Multisite installations. The web is full of really useless “greatest backup plugins” and “best WordPress backup” lists, as these ignominiously mix up paid and free plugins. Moreover, they hardly write a word about Multisite (also called WordPress MU for MultiUser or site network). I really had a […]

Multimedia, codecs, MP3 & DVD support on CentOS, Scientific Linux or RHEL

This tutorial details how to install full multimedia support, media codecs, MP3 & DVD support on Red Hat Enterprise Linux (RHEL) and its derivatives CentOS, Scientific Linux, Oracle Linux, ClearOS, … This howto assumes that you already installed RPMforge. To prevent conflicts and keep it simple, RPMforge is the only extra repostory we will use. […]

How to change the default application for a type of file on Linux

This howto explains how to change the default program to open all files with a given extension on Linux Mint, Ubuntu, Debian, and most Linux distributions. It also details how to change the default application for a batch of filetypes, for example all audio files or all video files. Set the default program for a […]

Sudo on CenOS, Red Hat Enterprise Linux and Scientific Linux

Sudo on CentOS / Scientific Linux / RHEL

This short howto is about setting up sudo on Red Hat Entreprise Linux and its derivates CentOS and Scientific Linux. It also gives a quick introduction on using the vi text editor through visudo. Becoming root: su & sudo CentOS, Scientific Linux and RHEL do not use sudo as Ubuntu does. Instead, you are supposed […]

10 reasons not to use Hotmail

Did you ever try to explain to a friend why he or she shouldn’t use Hotmail? There are many good reasons to avoid Microsoft’s services, but these reasons are not so easy to explain in a clear and unambiguous way. This article details 10 technical and ethical reasons about why Hotmail is not a good […]

DVD support on Linux with libdvdcss

Install DVD support (libdvdcss) on Debian or Ubuntu

On Linux, DVD support is provided through the libdvdcss or libdvdcss2 packages. Some distributions already include these packages (Linux Mint, Kodi/XBMC), but most don’t. Distributions without pre-installed DVD playing capabilities are Debian, Ubuntu, SUSE Linux, Fedora, … In earlier Ubuntu releases, DVD support as well as many other media codecs were available through the Medibuntu […]

Screenshot featuring a chameleon installing Virtual Box on a CentOS computer

Install VirtualBox on CentOS / RHEL / Scientific Linux

This how-to is about installing VirtualBox on CentOS. Provided instructions should also work on Scientific Linux and Red Hat Enterprise Linux (RHEL). It is possible to install VirtualBox from rpm packages, which can be downloaded on the VirtualBox Linux downloads page. However, a yum-style repository is also provided – we’ll use the latter. DKMS, RPMForge, […]

Install Flash Player directly from Adobe on Linux Mint, Ubuntu, …

Adobe Flash Player freezes constantly on my Ubuntu installation, sometimes crashing Firefox. Most of the time though, Firefox freezes for about a minute (the window gets darker) and “recovers”, but is still not playing Flash content or Youtube videos. Flash installation through Ubuntu Software Center fails Installing and uninstalling flashplugin-installer from the Software Centre didn’t […]

Older archived articles

Ubuntu & NVIDIA: external monitor, rotation, … (.pdf) January 2011: This how-to describes how to configure external monitors with the “NVIDIA X Server Settings” utility and enable rotation with RandRRotation. A new application background in OpenOffice Writer (.pdf) July 2009: playing with the application background in OpenOffice, including mockups of Writer with a picture or […]

How to install LibreOffice 3.3 on Ubuntu Linux

This article describes how to install LibreOffice on Linux. The installation may be based on the official .deb packages (installs without replacing or based on the LibreOffice ppa (replaces OOo). This how-to is for debian based Linux distributions, such as Ubuntu (and variations) and Linux Mint. July 2011: Update available here. (LibreOffice 5.1 or […]

Cheat-sheet: creating a new WordPress site

On this post I’ll share my experience on building up WordPress sites. I’m not a WordPress Guru, but after having spent many years with Joomla and Drupal, I really feel that WordPress is the best solutions for my needs: creating relatively small websites and maintaining them effectively. Everything feels so good with WordPress that I […]