Mar 2022 / Linux

Ubuntu Boot Loop Problem: Fix Full Disk with 0 Bytes Space Left

If the Linux system boots in an infinite loop, the root filesystem partition is maybe full with 0 bytes left. I will show tips to free up space.

Mar 2022 / Quick Tip

[Quick Tip] Easiest Way to get your SSH Keys onto a new Machine

GitHub offers an easy HTTP-API to download your public key without prior setup. You can use it to easily configure SSH logins on a new machine.

Mar 2022 / Tutorial

Mail Security: MTA-STS + Mailcow

MTA-STS is a security mechanism to prevent attackers from rerouting, reading and modifying your emails. Read how to use MTA-STS with mailcow.

Feb 2022 / Apple

Transfer Contacts from Google to Apple: Fix Import/Export Problems (Birthday, Address, Picture, etc. missing)

There are several problems when importing vCards from Google to Apple Contacts: Birthdays without years, addresses without labels, profile pictures etc.

Jan 2022 / Photography

Photography Problems: Pink / Purple Lines on Long Exposure Images with ND Filters

I noticed pink / purple lines on the resulting images of my long exposure shots with my DSLR camera on sunny days and ND filters applied.

Dec 2021 / Tools

[How-to] Microsoft Teams: Add Animated Video Background Image (GIF)

Microsoft Teams doesn't allow to add an animated video background. This tutorial shows a trick how to change the virtual background into a GIF image.

Aug 2021 / macOS

Fix: macOS Network drops with LAN over USB-C Docking Station in Zoom, Teams, ...

If your MacBook with a LAN docking station kicks you out of meetings over Zoom, Microsoft Teams, BigBlueButton,... after a short time, I show how to fix it.

 German Aug 2021 / Smartphone

SMS Spam Virus blockieren: "Neue Voicemail", "Verpasster Anruf" etc.

Unbekannte Rufnummern verschicken Spam SMS mit "Neue Voicemail" oder "Verpasster Anruf". Ein Link darin installiert Schadsoftware. So blockiert man die SMS.

Aug 2021 / Smart Home

[How-to] Connect IKEA TRÅDFRI Devices (Lights, Driver, I/O Dimmer, ...) to Philips Hue Bridge

Since IKEA TRÅDFRI and Philips Hue both use ZigBee, this article shows how to use the I/O Dimmer to control lights and drivers over a Hue Bridge / Gateway.

Jul 2021 / Apple

Canon Printer: Enable macOS Big Sur Scan Function in System Settings

The scan function of my Canon Pixma MX925 multifunction printer isn't available in the Apple macOS Big Sur system settings. I will show you how to enable it.

 German Apr 2021 / Review

Die beste Wetter-App für Deutschland (2021)

Drei Wetter-Apps liefern drei verschiedene Wettervorhersagen. Jetzt reicht es! Dies ist die beste Wetter-App 2021 für Deutschland. (iPhone und Apple Watch)

Apr 2021 / Off-Topic

Field Report: Testing the 28-Hour Day Sleep Schedule for One Week

A field report, experiences, tips and thoughts from living one week in the 28-hours per day sleep cycle. The initial idea is based on a xkcd comic.

Apr 2021 / DevOps

macOS Big Sur: Python 3.7 Installation with Homebrew

A step-by-step tutorial on how to install Python 3.7 on macOS Big Sur with Homebrew and fix all upcoming bugs, errors and problems with popular packages.

Feb 2021 / Review

[Quality Test] Spotify vs. TIDAL: Music Streaming Comparison

This article compares the best and highest sound qualities of the music streaming services Spotify and TIDAL in a personal field test over 3 month.

Dec 2020 / DevOps

Self-Host and Dockerize Standard Notes Extensions with Docker-Compose

In this article we show how to use docker and docker-compose to host Standard Notes extensions on your own infrastructure.

Nov 2020 / DevOps

CSF / LFD Firewall: csf.pignore not working or ignoring processes

Sometimes, processes added to the csf.pignore file aren't ignored and alert mails still arrive. This article introduces several solutions and fixes.

Oct 2020 / Raspberry Pi

Raspberry Pi – Basic Setup on Raspbian (Raspberry Pi OS)

This quick guide describes the important steps to create a fully working Raspbian (Raspberry Pi OS) system (langauge setup, static IP, expand disk etc.).

Oct 2020 / Research

Run 16-Bit Lotus AmiPro 3 (1992) on 64-Bit Windows 10

My dad manages his work related documents with the 30 year old 16-bit program Lotus AmiPro 3.0. We can make it run on 64-bit Windows 10 by using winevdm.

Oct 2020 / Apple

[How-to] Fix Apple Watch Band not Locking into Place (no click)

Some Apple Watch wrist bands are faulty and do not lock into place. They slide just through and produce no click sound. You can fix it by applying pressure on the locking mechanism.

Sep 2020 / DevOps

[How-to] Own CA Certificate in GitLab CI with dind service (docker-in-docker)

How to properly install a custom CA certificate in GitLab CI dind service to prevent the error: "x509: certificate signed by unknown authority".

Sep 2020 / DevOps

[How-to] Migrate ownCloud 10.5.0 to Nextcloud

This step-by-step tutorial explains how to migrate an existing ownCloud instance to Nextcloud by preserving existing shares and federations.

Sep 2020 / Raspberry Pi

Raspberry Pi 3 as Desktop Replacement – 21:9 Ultrawide, exFAT, VS Code, ...

Raspberry Pi 3 as desktop replacement: 21:9 ultrawide resolution support, exFAT support, use latest software: Visual Studio Code, node.js, neovim

Sep 2020 / Tools

Nextcloud 19 Server: Allow iframe / embedding from external Domains

If you host your own Nextcloud 19 server and you try to embed the content from other URLs or domains via an iframe or other HTML elements it doesn't work. The solution for the problem is briefly described in this blog post.

Aug 2020 / Photography

[How-to] DSLR APS-C Sensor cleaning (Nikon Camera Example)

In this step-by-step tutorial I will show you how to clean your DSLR sensor (Nikon camera example) by yourself with a simple and cheap cleaning kit.

Jul 2020 / Review

Jabra Evolve2 85: Test, Review & Hands-on the Bluetooth Headset

A detailed test & review of the new Jabra Evolve2 85 bluetooth over-ear headset / headphones with charging stand and infos about mic, sound and quality.