Linux

Common Problems 118972

Ubuntu 14.04 LTS kernel panic triggered by outdated HWE stack

🔴 Critical   ⏱ 5–30 min  Last verified: 29 August 2020 Affected versions: 14.04 14.04.5 📖 ~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 117428

Ubuntu 20.04 LTS – apt update fails due to expired repository Release file

🟡 Medium   ⏱ 5–30 min  Last verified: 29 August 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 […]

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How to Set Up Docker Swarm Cluster on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up Docker Swarm Cluster on Debian 10

Introduction How to Set Up Docker Swarm Cluster on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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Alpine Linux edge — pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.0.49-r1 📖 ~4 min read  •  Source: Alpine secdb entry — pure-ftpd 1.0.49-r1 Related CVEs: CVE-2020-9274 CVE-2020-9365 Upstream summary: Alpine community repository for vedge ships pure-ftpd 1.0.49-r1 which addresses CVE-2020-9274. Table of contents Symptom & Impact […]

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How to Install OpenStack on Ubuntu 18.04  with DevStack — step-by-step Linux tutorial on Progressive Robot

How to Install OpenStack on Ubuntu 18.04 with DevStack

URL: https://www.progressiverobot.com/install-openstack-ubuntu-devstack/ Openstack is a free and opensource IaaS cloud platform that handles cloud compute, storage and network resources. It comes with an intuitive dashboard that enables systems administrators to provide and monitor these resources. You can seamlessly install OpenStack locally on your Ubuntu 18.04 instance for learning and testing purposes using Devstack. Devstack is […]

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Debian 10 — gst-plugins-ugly1.0 — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — gst-plugins-ugly1.0 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 August 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker 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 […]

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Arch Linux — atftp — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — atftp — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202101-24 Related CVEs: CVE-2020-6097 Upstream summary: Type: denial of service. Status: Fixed. Affected: 0.7.2-2. Fixed in: 0.7.2-3. Group: AVG-1395. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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How to Configure Mandatory Access Control with SELinux Policies on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Mandatory Access Control with SELinux Policies on RHEL 8

SELinux Mandatory Access Control (MAC) confines processes to only the resources they legitimately need, limiting the damage an attacker can do even after exploiting a vulnerability. While RHEL 8 ships with broad pre-built policies for common services, custom applications often generate AVC (Access Vector Cache) denial messages because no policy exists for them yet. Rather […]

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Common Problems 121192

Debian 10 – Fail2ban blocks internal monitoring and trusted hosts

🟡 Medium   ⏱ 5–30 min  Last verified: 28 August 2020 Affected versions: Debian 10 📖 ~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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