Linux

Oracle Linux 8 — ruby:2.5 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — ruby:2.5 — vulnerability — patch and remediation guide (ELSA-2022-0545)

🟠 High   ⏱ 15–60 min  Last verified: 14 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-0545 Related CVEs: CVE-2020-36327 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Oracle Linux 8 — icu — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — icu — vulnerability — patch and remediation guide (ELSA-2020-0902)

🟠 High   ⏱ 15–60 min  Last verified: 14 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-0902 Related CVEs: CVE-2020-10531 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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How To Upgrade to Ubuntu 20.04 Focal Fossa — step-by-step Linux tutorial on Progressive Robot

How To Upgrade to Ubuntu 20.04 Focal Fossa

The Ubuntu operating system’s latest Long Term Support (LTS) release, Ubuntu 20.04 (Focal Fossa), was released on April 23, 2020. This guide will explain how to upgrade an Ubuntu system of version 18.04 or later to Ubuntu 20.04.

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How To Install Linux, Apache, MySQL, PHP (LAMP) stack on Arch Linux — step-by-step Linux tutorial on Progressive Robot

How To Install Linux, Apache, MySQL, PHP (LAMP) stack on Arch Linux

This tutorial explains how to install Apache, how to install MySQL, how to change the root MySQL password, how to install PHP, and how to see what libraries are available. LAMP stack is a group of open source software used to get web servers up and running. The acronym stands for Linux, Apache (the web server), MySQL (the database), and PHP (the language). This tutorial is written for Arch Linux.

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Gentoo Linux — dev-python/pypy — vulnerability — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — dev-python/pypy — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202409-12 Related CVEs: CVE-2020-27619 Upstream summary: Multiple vulnerabilities have been discovered in pypy. Please review the CVE identifiers referenced below for details. Table of contents Symptom & Impact Environment & Reproduction Root […]

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Oracle Linux 8 — thunderbird — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — thunderbird — vulnerability — patch and remediation guide (ELSA-2020-0127)

🟠 High   ⏱ 15–60 min  Last verified: 14 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-0127 Related CVEs: CVE-2019-17022 CVE-2019-17017 CVE-2019-17016 CVE-2019-17026 CVE-2019-17024 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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How to Set Up Grafana Alerting and Notification Channels on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Set Up Grafana Alerting and Notification Channels on RHEL 8

Grafana 10 ships with a completely redesigned unified alerting engine that replaces the older panel-level alerts, offering multi-dimensional alert rules, flexible notification policies, and first-class support for external notification channels including Slack, email, and PagerDuty. Rather than binding an alert to a single dashboard panel, unified alerting lets you define alert rules independently against any […]

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Oracle Linux 8 — raptor2 — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — raptor2 — security and stability fixes — required update (ELSA-2021-1842)

🟡 Medium   ⏱ 10–30 min  Last verified: 13 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-1842 Related CVEs: CVE-2017-18926 CVE-2020-25713 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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Common Problems 119001

Ubuntu 14.04 LTS failed to fetch archive packages with 404 Not Found

🟡 Medium   ⏱ 5–30 min  Last verified: 13 January 2021 Affected versions: 14.04 14.04.6 📖 ~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 & Hardening Related Errors & […]

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Common Problems 118416

Ubuntu 16.04 LTS – apt update shows NO_PUBKEY signature failures

🟠 High   ⏱ 5–30 min  Last verified: 13 January 2021 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

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