ubuntu

Ubuntu 24.04 — libcaca — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 24.04

Ubuntu 24.04 — libcaca — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 2 August 2024 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7943-1 Related CVEs: CVE-2022-0856 Upstream summary: Han Zheng discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to cause libcaca to crash. Table of contents […]

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Ubuntu 16.04 — ceph — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — ceph — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 2 August 2024 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8045-1 Related CVEs: CVE-2024-31884 CVE-2024-47866 CVE-2018-14662 CVE-2021-3524 CVE-2023-43040 CVE-2020-10753 CVE-2020-12059 CVE-2020-1760  +3 more Upstream summary: Martin Schobert discovered that Ceph did not properly verify SSL certificates when using Pybind for […]

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Common Problems 116420

Ubuntu 24.04 LTS – apt update fails with NO_PUBKEY or expired key – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 2 August 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 14.04 — ceph — multiple vulnerabilities (9 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — ceph — multiple vulnerabilities (9 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 1 August 2024 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8045-1 Related CVEs: CVE-2024-31884 CVE-2024-47866 CVE-2018-14662 CVE-2021-3524 CVE-2023-43040 CVE-2016-5009 CVE-2016-7031 CVE-2016-8626  +1 more Upstream summary: Martin Schobert discovered that Ceph did not properly verify SSL certificates when using Pybind for […]

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Ubuntu 16.04 — golang-go.crypto — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — golang-go.crypto — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 31 July 2024 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7839-1 Related CVEs: CVE-2024-45337 Upstream summary: Damien Tournoud, Patrick Dawkins, Vince Parker, and Jules Duvivier discovered that Go Cryptography incorrectly handled public keys during SSH operations. An attacker could possibly […]

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Common Problems 117618

Ubuntu 20.04 LTS – UFW blocks SSH access after firewall enable

🔴 Critical   ⏱ 5–30 min  Last verified: 30 July 2024 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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Common Problems 116558

Ubuntu 24.04 LTS TLS Certificate Validation Fails Due to CA Store Issues

🟠 High   ⏱ 5–30 min  Last verified: 30 July 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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Common Problems 116478

Ubuntu 24.04 LTS cloud-init Waits Indefinitely for Datasource

🟠 High   ⏱ 5–30 min  Last verified: 30 July 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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How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 24.04

Two-Factor Authentication (2FA) adds an extra layer of security to SSH by requiring a time-based one-time password (TOTP) in addition to your SSH key or password. This guide configures Google Authenticator PAM for SSH 2FA on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo […]

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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 GitLab CE on Ubuntu 24.04

GitLab Community Edition is a full-featured DevOps platform that combines Git repository management, CI/CD pipelines, issue tracking, and a container registry in a single application. This guide installs GitLab CE on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Minimum 4 GB RAM (8 GB recommended) A domain […]

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