Articles in Linux | UserComp.com

Iptables Not Dropping UDP Packets with Exact IP Address

This article explains why iptables may not be dropping UDP packets with exact IP addresses and provides solutions to resolve this issue.

Routing Traffic Between Different Table/Backend Interfaces: wlan0 and wg0

Learn how to configure and route traffic between two manually configured interfaces, wlan0 and wg0, with different table/backend configurations.

Hardening RHEL 8.9: Applying crypto_LUKS Encryption to Active Partitions

Learn how to apply crypto_LUKS encryption to active partitions in RHEL 8.9 for enhanced security.

Understanding Homebrew: Installing NPM Packages in Local Project Directories

Homebrew is a popular package manager for macOS and Linux systems. Users often wonder why they need to install NPM packages globally using Homebrew instead of directly in their project directories. In this article, we will clarify the concept and provide an explanation.

Setting Up Debian 12 with NTFS Partitions: A Guide for Smooth Access

Learn how to set up Debian 12 with NTFS partitions for seamless access to data from other systems. This quick guide covers the essential steps to avoid common issues during installation or upgrade.

Interactive zsh Completion: Format and Using Interactive Menus

Learn how to use interactive menus in zsh completion system. This article covers the basics of zstyle:completion:*:warnings and enabling interactive menus.

Handling Email Delivery with Dynamic IP Addresses on Ubuntu Server using Postfix

Learn how to handle email delivery on a Ubuntu server with a dynamic IP address using Postfix. This includes setting up DNS records and configuring Postfix to adapt to IP address changes.

Locking Down MobaXterm (SSH) Tab Changes and Editing

Learn how to lock down MobaXterm's SSH tabs to prevent accidental changes and enhance security.

Understanding Opus Encoding and Maximum Audio Quality in FFmpeg: Bitrate Stuck at 96kbps?

In this tech support article, we'll help you understand the Opus encoding process in FFmpeg and how to achieve maximum audio quality when the bitrate is stuck at 96kbps.

Configuring ALSA Loopback with Simultaneous Headphone Outputs on Ubuntu 22.04

Learn how to configure ALSA (Advanced Linux Sound Architecture) to use loopback audio with multiple headphone outputs on Ubuntu 22.04. This tutorial will help you hear audio from the loopback streams in both headphones simultaneously.

How to Disconnect and Reconnect Tmux Sessions Without Losing Content: A Tech Support Guide

Learn how to disconnect and reconnect Tmux sessions without losing any content, even when transferring large files across multiple servers. This guide is designed for users of Linux, MacOS, and Windows who need to manage multiple SSH or SFTP sessions at once.

Solaris shd_config File: Reset, Restart ssh-d Prevents Subsystems

This article explains how to reset and restart the ssh-d service in Solaris after making changes to the shd_config file related to ssh subsystems.

Troubleshooting DDEV PowerShell Installation

Encountering issues while installing DDEV PowerShell? Follow this article for suggested solutions based on instructions from the official Drupal documentation.

Docker Compose Freezes EC2 t2.micro Instance: A Solution

This article discusses a common issue where Docker Compose freezes an Amazon EC2 t2.micro instance. We'll suggest a potential solution to prevent this issue and keep your instance responsive.

Understanding and Using SEBOOL Settings in Tech Support

In tech support, understanding and using SEBOOL settings can help diagnose and resolve various issues. This article explains what SEBOOL is, its location in logs, and how to interpret the alerts.

No Sound on Legion-7-16IAX7: Dualbooting Win11 Pro & Ubuntu 22.04 LTS with TAS2781 Realtek (Update: Cirrus)

Users report no sound output when dualbooting Windows 11 Pro and Ubuntu 22.04 LTS on Lenovo Legion 7-16IAX7, despite following updates and troubleshooting steps. Learn potential solutions.

Using Mirrored Network with Default WSL2 Distribution for NAT-bound Applications

In this article, we discuss how to set up a mirrored network with the default WSL2 distribution while keeping the NAT settings in place. This setup is particularly useful for Docker Desktop and other containerized applications.

Using a Mirrored Network with WSL2 for Docker Desktop: A NAT Perspective

In this tech support article, we will discuss how to use a mirrored network with WSL2 for Docker Desktop while remaining on NAT.

Quarantining Kernel-Level Games onto VM: Linux Partition Isolation

Learn how to isolate kernel-level games like Valorant running on a VM from the Linux host system, ensuring virtualization layer security.

Remapping Artist Shortcut Keys on XP-Pen Tablet for Remote Linux Use

Learn how to remap artist shortcut keys on XP-Pen tablets for remote Linux use. Default dial keys are mapped to keyboard strokes, but you can customize them for optimal workflow.

Samba Shares Fail: Pre-Authentication Failed on Multi-HPC Systems

Experiencing issues with Samba shares failing during file transfers on multiple High Performance Computing (HPC) systems? This article explores possible causes and solutions for the Pre-Authentication Failed error.

Configuring WireGuard Peers on Ubuntu Server for Two Win11 Clients

Learn how to configure WireGuard peers on an Ubuntu server for two Win11 clients with IP addresses 10.10.0.1 and 10.10.0.2, and server IP 10.10.0.3. This guide covers server ping clients and clients ping server.

Setting up Yubikey as a second factor for login on Linux Mint 21.3

This article explains how to set up Yubikey as a second factor for login on Linux Mint 21.3. The focus is on using a Yubikey 5CNFC and configuring the PAM file in /etc/pam.d/common-auth.

Configuring a New User on AWS EC2 with SSH (Ubuntu)

This article explains how to configure a new user on an AWS EC2 instance using SSH keys for authentication. Follow the instructions below to create a new user and set up SSH access.

Changing Tmux Copy Mode Search Highlight Color

Learn how to change the search highlight color in Tmux copy mode. Tmux is a terminal multiplexer that enables multiple terminal sessions to be accessed from a single terminal.

TLSv1.0 and TLSv1.1 Still Active: Securing Apache with IETF Protocols

This article explains how to prevent the usage of TLSv1.0 and TLSv1.1 protocols in Apache servers. It provides instructions on modifying Apache configuration files to enforce secure connections.

Setting Port Forwarding for Guest VM using iptables: A Proof of Concept

In this tech support article, we will guide you through the process of setting up port forwarding for a Libvirt guest server using iptables. This proof of concept will demonstrate how to open a specific port (500) for incoming connections to the guest VM. Please follow the instructions carefully.

Using KWallet Mapper and KWallet CLI for Password Management

Learn how to use KWallet Mapper and KWallet CLI for managing passwords in a terminal on Linux.

SSD Installation Failed: Deleting Partitions Prevented Ubuntu Installation

Learn how to troubleshoot and resolve an issue where deleting partitions on an external SSD prevented the installation of Ubuntu Server.

Connecting Ubuntu 20.04 to Hyper-V using OpenSSH, not vsftpd

Learn how to connect Ubuntu 20.04 to Hyper-V using OpenSSH instead of vsftpd. Follow these steps to set up a secure SSH connection.

Switching Back to Dual Boot: Windows on Subunitu with KVM/QEMU

Learn how to switch back to dual boot Windows on Subunitu after using KVM/QEMU for a distinct partition. Follow these steps to restore your system.

Reset X Window Layout in WSL2 for Windows 10: A Tech Support Guide

Learn how to reset the X Window layout in WSL2 (Windows Subsystem for Linux 2) when your computer monitors go to sleep and your X windows become half-rendered or off-screen. This tech support article provides a step-by-step guide.

Sudo Complain: DNS Name Resolution in Ubuntu 22.04

This article explains what happens when you manually edit /etc/resolv.conf using sudo and encounter a complaint about DNS name resolution in Ubuntu 22.04.

Linux Won't Boot with f2fs: Troubleshooting Failed fsck

Recently replaced HDD with SSD and set up f2fs root partition. Unable to boot properly due to fsck failure. Keep getting error messages...

Troubleshooting Docker: 'Setting lan cache' encounters 'docker error: host already used another container'

This article provides a solution for the Docker error 'host already used another container' encountered while setting up lan cache.

Nmap Not Showing Open RTP RTCP Ports

Users report that Nmap is not detecting open RTP and RTCP ports on a target device. This article explains possible causes and solutions for this issue.

Zoom App Not Displaying Video: A Solution for Kubuntu 22.04 Users

This article offers a solution for Kubuntu 22.04 users experiencing issues with the Zoom app not displaying video during virtual meetings. The problem is addressed by installing the Zoom client using Snap and checking the video settings.

Setting Up a Home Lab Server Accessible Externally with Dynamic IP using Duck DNS

Learn how to set up a home lab server accessible externally with a dynamic IP address using Duck DNS. This guide covers the necessary steps for configuring your server and setting up Duck DNS.

GNOME 44.10: Drag-and-drop breaks Alt+Tab window switching on Bluefin-based Fedora Silverblue atomic desktop

Users of Bluefin-based Fedora Silverblue atomic desktop with GNOME shell running on Wayland have reported an issue where drag-and-drop functionality disrupts the Alt+Tab window switching. This article provides a workaround to resolve the problem.

Troubleshooting vsftpd Configuration Issues

Learn how to diagnose and fix common issues with vsftpd FTP server configuration on Debian-based distributions.

Installing Arch Linux on Acer Predator Helios 300 (Neo 16) - Boot Arch Live Environment Stuck During Mounting Process

This article provides a step-by-step guide to troubleshoot and resolve the issue of getting stuck during the mounting process while installing Arch Linux on an Acer Predator Helios 300 (Neo 16) using the Boot Arch Live Environment.

SSH Connection Permission Denied on New Ubuntu 22.04 LTS Server

Users setting up a new Ubuntu 22.04 LTS server encounter an issue when trying to connect via SSH from their MacBook, receiving a 'Permission denied' error. This article outlines potential causes and solutions.

Troubleshooting: Operating System Not Found During Linux Mint Installation on a Windows 10 Laptop

If you encounter an 'Operating System Not Found' error while installing Linux Mint alongside Windows 10 on an older laptop, follow these steps to resolve the issue.

Configuring PFsense as a Firewall for Network Traffic on a Ubuntu VM with an ATT Modem WiFi6 Router

Learn how to configure PFsense as a firewall for network traffic on a Ubuntu VM with an ATT Modem WiFi6 router.

Getting Intel i210 NIC Ethernet Card Working on Linux

Experiencing issues with an Ethernet port on an ASUS Prime Z370-P motherboard? Try installing an Intel i210 NIC Ethernet card for a potential solution. Learn how to set it up on Linux in this tech support article.

Docker in Docker: Why is My Dev Container Using Excessive Disk Space?

When developing Home Assistant add-ons using Visual Studio Code dev containers, the container runs Docker (inside the host Docker). Hours of work can result in significant host Docker disk usage. Learn how to optimize your Docker setup.

Mounting External Backup Drive with Script

Learn how to mount an external backup drive using a script in Linux. This script automatically mounts the drive with the given UUID.

Booting LUKS-encrypted Drive (Flashdrive) with GRUB: Keyboard Fallback

Learn how to boot a LUKS-encrypted drive using GRUB and keyboard fallback.

Traffic Not Passing OPNsense Firewall in Hyper-V: Troubleshooting Steps

Experiencing issues with traffic not passing through OPNsense firewall in Hyper-V? Follow these steps to troubleshoot and resolve the problem.

VBox Guest: Local Port Forwarding for SSH Access on Debian

Learn how to set up local port forwarding in VirtualBox for SSH access to a Debian guest operating system using a NAT network adapter.