When you get this error message from e.g. loginctl show-user [...] after you deleted a user from your system:
What is netfilter's Connection Tracking system? The connection tracking system often referenced as nf_conntrack is part of the...
6.0.0 2021-06-02 Compatible changes geordi commit will continue even if one of the given projects is inaccessible. It...
ZSH is an alternative command line shell that includes some features like spelling correction, cd automation, better theme, and plugin...
By default parallel_tests will spawn as many test processes as you have CPUs. If you have issues with flaky...
By default, your terminal emulator (Gnome Terminal, Terminator, etc.) sets some kind of window title to reflect the shell type...
Ubuntu 18.04 uses systemd to manage services. There are basically two commands for listing all services and manipulating the state...
After a recent Ubuntu update I didn't see the main menu bar of the RubyMine IDE (File | Edit | View...
Because colors improve readability so much. On Ubuntu 18.04 you can install it with sudo apt install grc
SimpleScreenRecorder I recommend simplescreenrecorder, it produces an adequate output with only a few clicks. The audio recording contained some...
When text renders differently in Firefox and Chrome, it may be caused by a font alias that both browsers handle...
When using Chrome for Selenium tests, the chromedriver binary will be used to control Chrome. To debug problems that stem...
Unfortunately I couldn't find a complete and working documentation on how to do this. But this steps succeeded (at...
There are several ways to merge two (or more) PDF files to a single file using the Linux command line...
The issue in this card can occur if the node_modules directory is checked into your Git repository. We usually...
Set up a package root in your homedir to hold the Node "global" packages: $ NPM_PACKAGES="$HOME/.npm-packages"
The rendered font often depends on the local font your system provides, therefore you often find a rule like below...
When you receive a ZIP file from a Windows user, umlauts and other non-latin1 characters in filenames may look...
Boot partitions from installations prior to the 16.04 era are terribly small. When you install updates and encounter errors due...
The httpclient gem comes with a custom SSL cert store. While an customizable, application-level cert store is great when...
Your default postgres user is named like your linux user. That default user has limited access privileges, which can cause...
If you want to make a screenshot of a website that works well in print or on a high-DPI...
Let's say you have a folder images and want to to move all files in there to a new...
ImageMagick has a command line tool called identify which can read image metadata: >identify -verbose DSC00136.JPG Image: DSC00136.JPG Format: JPEG...