UbuntuEd #24.09: Linux Kernel Management, A New Security Center, Treedome Note-Taking App and More

Sep 27, 2024 — Abhishek

Here's the latest edition of UbuntuEd monthly newsletter for you.

🪧 Working with Linux kernels in Ubuntu

It is the underlying Linux kernel, that makes all these distributions possible. The kernel is the core of an operating system. Most operating system, including Ubuntu, adds some additional packages and frameworks on top of this kernel to get a usable system that can power your PC.

In this week's newsletter, we will be taking a look at various kernel management process in Ubuntu.

Before we dive into managing kernel, let's see what a Linux kernel means:

Knowing the version of kernel used is beneficial for both system management and occasional troubleshooting.
Ubuntu usually keeps more than one kernel (two) installed on the system. And at times, you may install a different kernel for compatibility purposes. In these cases, it is handy if you can list all installed kernels.
Sometimes, installing the mainline kernel in Ubuntu can improve your hardware performance or clear some bugs. This guide will show you how to do that!
Here is a quick guide on upgrading the kernel in various scenarios.
There are multiple methods through which you can remove older Linux kernels in Ubuntu.

You may get a “Pending kernel error in Ubuntu 22.04 server”. Know more about this issue.

🗞 Ubuntu News

Authd, a new open-source authentication tool, introduces support for OIDC authentication on Ubuntu.
A new flutter-based dedicated Security Center is approaching a stable release in Ubuntu.
Ubuntu 24.10 Beta is now available for download.
A new status update from Ubuntu hints bringing KDE Plasma desktop to Ubuntu Core desktop in Snap form.

💡 Command Line Tips

If you want to create multiple directories in a folder, you can do that using the mkdir command.

Let’s say we want to create directories like:

In this case, we have a pattern. So, we will give that pattern to mkdir.

mkdir ItsFOSS-{Debian,Ubuntu,Fedora,Arch,Manjaro}-{Sample,Test,Work}

Here, we have given an array of items. The same works, if we are giving a range of numbers or alphabets.

Let’s create a directory structure to organize your photo collection from 2018 to this year, with one folder for each month.

mkdir {2018-2024}-{01-12}

The range can also be {A…Z}, {Z…A}, etc.

🧰 Useful Tool

There are a variety of note-taking applications available for Linux with various underlying techs, like Markdown, plain text, etc. Cherrytree was one such app, that follows a hierarchical not taking.

Treedome is another note-taking app, inspired from Cherrytree, and follows a hierarchical local-first note-taking. The app is still under development, but it is worth a try.