Linux

Common Problems 118929

Ubuntu 14.04 LTS apt Lock Contention During Updates

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: 14.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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Common Problems 115433

RHEL 7 – systemctl Fails to Start Service After Unit File Edit

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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AlmaLinux 8 — driverctl — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — driverctl — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2020:1752 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Common Problems 115406

RHEL 7 systemctl Service Fails After Package Upgrade

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: RHEL 7 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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AlmaLinux 8 — libfastjson — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libfastjson — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2023:6976 Related CVEs: CVE-2020-12762 Upstream summary: The libfastjson library provides essential JavaScript Object Notation (JSON) handling functions. The library enables users to construct JSON objects in C, output them as JSON-formatted strings, […]

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How To Use RKHunter to Guard Against Rootkits on an Ubuntu VPS — step-by-step Linux tutorial on Progressive Robot

How To Use RKHunter to Guard Against Rootkits on an Ubuntu VPS

Rootkits are a serious problem for any internet-facing computers. A rootkit allows an intruder to continue to access the compromised machine even after the initial point of entry has been secured. In this article, we will cover how to check your server against known rootkits using a utility called rkhunter.

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How to Use Ansible to Automate Initial Server Setup on Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

How to Use Ansible to Automate Initial Server Setup on Ubuntu 18.04

Ansible offers a simple architecture that doesn’t require special software to be installed on nodes. It also provides a robust set of features and built-in modules which facilitate writing automation scripts. This guide explains how to use Ansible to automate the steps contained in our Initial Server Setup Guide for Ubuntu 18.04 servers.

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Считывание и настройка переменных оболочки и окружения в Linux — step-by-step Linux tutorial on Progressive Robot

Считывание и настройка переменных оболочки и окружения в Linux

В системах Linux переменные окружения и оболочки используются для определения рабочих условий оболочки. Их можно передавать в дочерние процессы и использовать для настройки опций и предоставления определенной информации, доступной процессам, которые запущены в сеансе. В этом руководстве мы поговорим о том, как читать, изменять, создавать и уничтожать переменные среды и переменные оболочки.

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