Linux

Common Problems 117008

Ubuntu 22.04 LTS – SSH public key auth fails with permission denied – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 December 2024 Affected versions: Ubuntu 22.04 LTS (Jammy) 📖 ~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 […]

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How to Install Cassandra on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Install Cassandra on CentOS Stream 10

Introduction How to Install Cassandra on CentOS Stream 10 on CentOS Stream 10 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is reproducible […]

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Common Problems 116430

Ubuntu 24.04 LTS – DNS resolution fails with systemd-resolved – Fix & Prevention (FIX-PREVENTION-2)

🟠 High   ⏱ 5–30 min  Last verified: 28 December 2024 Affected versions: Ubuntu 24.04 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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Ubuntu 24.04 — edk2 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 24.04

Ubuntu 24.04 — edk2 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 28 December 2024 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7894-2 Related CVEs: https://launchpad.net/bugs/2133157 CVE-2024-9143 CVE-2024-4741 CVE-2023-0464 CVE-2024-6119 CVE-2024-13176 CVE-2023-2650 CVE-2024-0727  +12 more Upstream summary: USN-7894-1 fixed vulnerabilities in EDK II. The update introduced a regression in the UEFI network […]

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How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Harden SSH on Ubuntu 24.04

SSH is the primary remote access method for Linux servers and is a common target for brute-force attacks. This guide walks through SSH hardening best practices on Ubuntu 24.04 LTS to significantly reduce your attack surface. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server SSH key-based authentication already configured A user […]

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SLES 15 — npm12 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — npm12 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 28 December 2024 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2024:1301-1 (see also SUSE bugzilla) Related CVEs: CVE-2024-27983 CVE-2024-22019 CVE-2023-30581 CVE-2021-37701 CVE-2021-37712 CVE-2021-37713 CVE-2021-39134 CVE-2021-39135  +12 more Upstream summary: An attacker can make the Node.js HTTP/2 server completely unavailable by sending a […]

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How to Install Vagrant and VirtualBox on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Install Terraform on Ubuntu 24.04

Terraform is a popular Infrastructure as Code (IaC) tool from HashiCorp that lets you provision and manage cloud resources using a declarative configuration language (HCL). This guide installs Terraform on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges A cloud provider account (AWS, […]

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Alpine Linux 3.19 — bareos — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux 3.19

Alpine Linux 3.19 — bareos — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.19 / fixed in 19.2.8-r0 📖 ~4 min read  •  Source: Alpine secdb entry — bareos 19.2.8-r0 Related CVEs: CVE-2020-4042 CVE-2020-11061 Upstream summary: Alpine community repository for vv3.19 ships bareos 19.2.8-r0 which addresses CVE-2020-4042. Table of contents Symptom & Impact […]

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Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2024-12713)

🟠 High   ⏱ 15–60 min  Last verified: 28 December 2024 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-12713 Related CVEs: CVE-2024-49863 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 — ruby:3.3 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — ruby:3.3 — vulnerability — patch and remediation guide (ELSA-2024-6784)

🟡 Medium   ⏱ 10–30 min  Last verified: 28 December 2024 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-6784 Related CVEs: CVE-2024-39908 CVE-2024-41123 CVE-2024-41946 CVE-2024-43398 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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