Articles in Linux | UserComp.com

Safely Upgrade OpenSSH on Remote Linux PCs (CentOS 6.7)?

Learn how to safely upgrade OpenSSH on remote CentOS 6.7 Linux PCs. This guide provides a script to filter temporary SSH access and avoid service interruptions.

Avoiding Nftables Configuration Mistakes: Allowing Outgoing SSH Connections

Learn how to avoid a common mistake when configuring nftables to allow outgoing SSH connections to a backup server. Make sure to follow best practices and test your rules before implementation. #nftables #Linux #networksecurity

Long Homebrew MySQL @ 8.0 Gets Security Updates

MySQL 8.0 on Homebrew will continue to receive security updates until April 2025. For extended support, consider Oracle's paid service until April 2026.

SSH Allowing Login Not Starting Command Prompt on AlmaLinux 9.5 (Teal Serval)

This article will guide you through troubleshooting an issue where the SSH login is allowed but hangs and disconnects, even for the root user, on AlmaLinux 9.5 (Teal Serval).

Improve Scrollbars in Debian 12 Small Installation Image Xfce 4.18

Learn how to improve scrollbars in Debian 12 Small Installation Image Xfce 4.18, similar to Ubuntu's sudo apt-get purge liboverlay-scrollbar-*.

Safely Upgrading OpenSSH on a Remote Linux PC

This article provides instructions on how to safely upgrade OpenSSH on a remote Linux PC. It covers temporary filtering of Telnet and testing the SSHD restart to ensure a smooth upgrade process.

Add CR LF in Firefox for Linux PCs

Learn how to add CR LF in Firefox on Linux PCs for proper line breaks in your text responses. Follow the simple steps provided.

Checking URL Requests Still Processed in Apache CentOS: A Tech Support Guide

Running Apache requests on CentOS can take a long time, sometimes up to 100 seconds. However, this doesn't necessarily mean there's a problem with the system. In this guide, we'll explore how to check if URL requests are still being processed in Apache CentOS and provide tips for troubleshooting common issues. Read more for helpful advice from our tech support team.

Optimizing Performance for Linux Systems

Learn how to optimize the performance of Linux systems by implementing various techniques such as system tuning, resource management, and kernel tweaks. Read more to explore the world of efficient Linux operations.

Benchmarking Execution Speed of Simple OpenCL Kernel on Three Different CPUs: Surprising Results

Recently, I executed a simple OpenCL kernel using PyOpenCL on three different CPUs and was surprised by the results. Contrary to my expectations, the kernel executed significantly faster on a less powerful CPU (i5-135...). This finding raises questions about the impact of processor capabilities on OpenCL kernel execution speed. In this article, I will discuss the details of the benchmark and the factors that might have contributed to this surprising result.

Prevent Firefox from showing update password dialog for specific website

This article provides a solution to prevent Firefox from showing the update password dialog for a specific website. Follow the steps below to avoid the prompt on the Modems Administration page with the CMCCAdmin password.

Concatenate FFmpeg Recording Segments without Resetting Timestamps: A Guide

Having trouble concatenating FFmpeg recording segments without resetting timecode data? Learn how to correctly join segmented videos using FFmpeg, without resetting timestamps.

Troubleshooting Kali Linux XFCE: Checking Media Presence, No Media Found Error

If you've installed Kali Linux XFCE a couple of weeks ago and it has been running smoothly, but suddenly one day your laptop shows a 'Checking Media Presence, No Media Found' error and gets stuck at the bootable device, this article is for you. We'll go through the steps to troubleshoot and solve this common issue in Kali Linux XFCE.

Rootless Podman Container Cannot Access Hosts File with Group Read Permission

This article provides a solution to access a shared certificate key in a rootless Podman container running an OpenLDAP service as a non-root user. The user encounters an issue with group read rights.

Linux Terminal: Pressing Alt+Super+(key) lists hosts in qterminal and Konsole, not terminals like xterm or gnome-terminal

This article explains how to press Alt+Super+(key) to list hosts in qterminal and Konsole, and provides a solution for those who are unable to execute programs in the terminal.

WSL2 and Mirrored Network Mode: A Compatibility Overview for Dev Projects

Explore the compatibility of WSL2 with the mirrored network mode, a common challenge faced when running dev projects in WSL2. Learn why WSL2 isn't compatible with curl containers and how to create a project that works in this mode.

Troubleshooting Return Traffic Not Routed Properly Through Passthrough Server

Having issue with return traffic not routed properly through your passthrough server? Learn how to identify and resolve this common networking problem. Improve your technical skills with our step-by-step tutorial. Read more...

Linux Not Responding to ECN Flags: Troubleshooting Guide

Experiencing issues with ECN flags on your Linux machine? Learn how to diagnose and resolve this problem with our comprehensive guide. Optimized for SEO. Read more to learn how to improve your tech support experience.

How to Fix Manjaro Linux on ASUSTUF Gaming B550M Plus Not Waking Up on Wireless

Having trouble with your Manjaro Linux system on ASUSTUF Gaming B550M Plus not waking up on wireless? Learn how to fix the issue with PCIe AX200 wireless card configuration in this step-by-step guide. Improve your Linux knowledge and resolve the problem today.

Concatenating FFmpeg Recording Segments without Resetting Timestamps: A Guide

Learn how to concatenate FFmpeg recording segments without resetting timestamp data. This guide will walk you through the process of correctly joining segmented videos. Keywords: FFmpeg, recording, concatenation, timecode

User Regex Search in PDF

This article will guide you on how to perform a user regex search in PDF files using Adobe Reader. Follow these simple steps to find text in your PDF files with ease.

Setting up NFS server in QEMU VM on macOS M1 using Vagrant (Alpine+Ubuntu 22.04)

In this tutorial, we will guide you through the process of setting up an NFS server in a QEMU virtual machine running on a macOS M1 host, using Vagrant and Alpine or Ubuntu 22.04 as guest operating systems. This setup will allow you to easily share files between your macOS host and your QEMU virtual machine.

Setting Up NFS on QEMU Vagrant (Alpine & Ubuntu 22.04) on M1 Host

Experiencing issues setting up NFS on QEMU Vagrant with Alpine and Ubuntu 22.04 on an M1 host? Learn how to troubleshoot and resolve common problems in this article. Read more for a comprehensive guide to configuring NFS on your QEMU Vagrant environment.

Batch Convert PNG-8 Images to WebP Preserving Original Indexed Color Palette

Learn how to batch convert PNG-8 images to WebP format while preserving the original 8-bit color palette on Windows 11. This article provides a step-by-step guide using a popular image converter tool.

Getting Proportional Resident Memory (PSS) for processes on MacOS

This article provides a guide on how to programmatically obtain Proportional Resident Memory (PSS) for processes on modern MacOS systems, including Sequoia and Apple Silicon.

Diagnosing Kernel Issues on Lenovo ThinkPad T14 Gen1

This article provides a guide on diagnosing kernel issues on Lenovo ThinkPad T14 Gen1. We will go through the necessary steps to generate the required JSON structure, not the full article. The content generated should not be explained, and the JSON output should be the focus. We will not generate additional content, only JSON content. The article body will not be included, as a separate request will be made for that. The JSON output will be stripped of whitespace. Here's the generated JSON output.

Converting MP4 to HLS format using FFmpeg on Windows 11, VM, and Azure

This article explains how to convert an MP4 H264 file to HLS format using FFmpeg on Windows 11, Windows 11 VM, and Windows Server VM local and Azure. The process works smoothly on all these platforms.

Ubuntu Laptop Enters Coma Every Time During Sleep Period Inactivity: Determine Cause

A Ubuntu 24.04 LTS laptop has started behaving strangely upon entering sleep period inactivity (manually put sleep). It refuses to go back online. The issue seems to be related to the laptop entering a coma-like state during sleep.

Stack Permission Denied: Root Container in Bookworm Debian Docker Image

This article discusses a common issue encountered when using the latest Bookworm Debian Docker image: a stack permission denied error when trying to view the stack of a process running in a root container. We'll explore the cause of this error and provide a solution.

Understanding the Virtual Documents Directory in Debian 12/Gnome

This article delves into the peculiarity of the Virtual Documents directory found in the Debian 12/Gnome system. Unlike regular directories, it seems to copy files that are not supposed to be there.

Converting MP4 to HLS format using FFMPEG on Windows 11, Windows 11 VM (local), and Windows Server VM (local & Azure)

This article guides you through the process of converting an MP4 H264 file to HLS format using FFMPEG on Windows 11, Windows 11 VM (local), and Windows Server VM (local and Azure).

Record Keyboard/Mouse Input on Linux/BSD Types of Operating Systems: Let it Run?

Learn how to record keyboard and mouse input on Linux/BSD systems. This article provides a step-by-step guide on how to let it run without capturing video of the screen. Improve your tech support skills and optimize your workflow with this useful tool.

Easily Connect Cisco AnyConnect on Debian 11

This article provides a solution for connecting Cisco AnyConnect on Debian 11, as it fails to connect on Android, iOS, and Windows. This guide is for ISP users.

Solving Postfix Newbie Issue: TLS 1.2 Ciphers Get Synology MailPlus Server to Accept SMTP Connection on Lorex DVR

Having trouble sending email notifications from Lorex DVR using Synology NAS MailPlus Server due to TLS connection failure? This guide focuses on solving the issue by updating the TLS 1.2 ciphers on the Synology MailPlus Server.

Upgrading Ubuntu 22.04 to 24.04: Forgot Encrypted Disk Key in VirtualBox?

Forgot the encryption key for your Ubuntu 22.04 VirtualBox disk while upgrading to 24.04? Don't worry! In this tech support article, we'll guide you through possible solutions to help you recover or bypass the key and successfully upgrade.

XAMPP Not Loading PHP Files Connected to Internet

Experiencing unreliable PHP file loading issues with XAMPP when connected to the internet. HTML files work flawlessly, but sometimes pages load instantly without issues, and other times they don't. Here's how to troubleshoot and resolve this issue.

Efficiently Encode FFmpeg Gameplay Footage Without Quality Loss

Learn how to re-encode your gameplay footage from OBS to a more distribution-friendly format using FFmpeg, without sacrificing quality or file size. This guide will help you optimize your workflow, ensuring high-quality videos while reducing storage requirements.

Mastering Vim: A Comprehensive Guide

Learn the ins and outs of the powerful text editor Vim with this comprehensive guide. Improve your productivity and become a Vim master.

Debugging a Desktop App Crash in Kiosk Mode

This article provides a step-by-step guide on debugging a desktop app that crashes in Kiosk Mode on various operating systems. Learn how to identify and resolve the issue for a smooth user experience.

Creating Accounts on Gaming Platforms Using Item Codes - Generating Random Outlook Accounts with Chrome

Learn how to create accounts on gaming platforms using item codes and generate random Outlook accounts with Chrome. Follow this guide for a hassle-free account creation process.

Clone Pool Data to Another Pool Without Changing App Configs

Learn how to clone a pool data to another pool without changing the app configurations on various operating systems such as Linux, Windows, and MacOS.

Change Docker containers PHP_MEMORY_LIMIT env variable for Dockerized Nextcloud on ASUSTOR NAS - ASUS TS-6302T

Learn how to change the PHP_MEMORY_LIMIT environment variable in Docker containers for Dockerized Nextcloud on an ASUSTOR NAS ASUS TS-6302T. This article provides step-by-step instructions to modify the PHP memory limit and optimize the performance of your Nextcloud app.

How to Drop Outgoing UDP Packets without Generating Socket Error

Learn how to drop outgoing UDP packets using iptables without generating a socket error. This can be useful for network performance testing or troubleshooting. Follow these simple steps to implement this rule on your Linux system.

Sync/Clone Multi-Partition External SSD to Another One

This article provides steps to sync or clone multi-partition external SSDs, such as Time Machine backups and another partition containing misc files. A 1TB encrypted SSD is used as an example.

How to Increase Available Space in Home Directory for Tech Support

If you receive a 'no space left on device' error while running the svn checkout command and cloning a remote repository that is around 9GB in size, this article provides a solution to increase the available space in your home directory. Learn how to free up space and optimize your storage for a smoother tech support experience.

How to Enable Scrolling in Tmux Copy Mode

Learn how to enable scrolling in Tmux copy mode, even if you're not using iTerm2. Follow these simple steps to improve your Tmux experience.

Two Routers, Two Connected LANs - No Bi-directional Pinging

In this article, we will discuss a common issue with two routers connected to two LANs that do not allow bi-directional pinging. This issue can occur due to various reasons, such as misconfigured IP addresses, incorrect subnet masks, or firewall settings. We will provide solutions to help you resolve this issue.

Troubleshooting Wireguard Peer Unable to Access Internet Without DNS Entry

Having trouble with a Wireguard peer unable to access the internet without a DNS entry? This guide will help you troubleshoot and resolve the issue. Learn more about Wireguard and VPS here.

Updating Linux Mint 21.3: Handling Unsafe Permissions Warning for .gnupg

When updating Linux Mint 21.3 with the Cinnamon desktop environment, you might encounter a warning regarding unsafe permissions for the .gnupg directory in a terminal window. Learn how to handle this situation without altering the name or JSON structure of your key files.

Updating Linux MINT (v21.3, 'Cinnamon') OS: Unsafe Permissions Warning for /root/.gnupg

Learn how to fix the unsafe permissions warning for /root/.gnupg that appears during semi-automatic updates in Linux MINT (v21.3, 'Cinnamon').