ubuntu

Ubuntu 18.04 — python-werkzeug — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — python-werkzeug — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 24 December 2024 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6799-1 Related CVEs: CVE-2024-34069 CVE-2023-23934 CVE-2023-25577 CVE-2019-14806 CVE-2020-28724 Upstream summary: It was discovered that the debugger in Werkzeug was not restricted to trusted hosts. A remote attacker could possibly use […]

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Common Problems 116435

Ubuntu 24.04 LTS – DNS resolution fails with systemd-resolved – Fix & Prevention (FIX-PREVENTION-3)

🟠 High   ⏱ 5–30 min  Last verified: 24 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 20.04 — dovecot — multiple vulnerabilities (13 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — dovecot — multiple vulnerabilities (13 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 24 December 2024 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7013-1 Related CVEs: CVE-2024-23184 CVE-2024-23185 CVE-2022-30550 CVE-2021-29157 CVE-2021-33515 CVE-2020-24386 CVE-2020-25275 CVE-2020-12100  +5 more Upstream summary: It was discovered that Dovecot incorrectly handled a large number of address headers. A remote […]

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Common Problems 116426

Ubuntu 24.04 LTS – Netplan apply fails from invalid YAML syntax – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 23 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 — flatpak — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 24.04

Ubuntu 24.04 — flatpak — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 23 December 2024 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7046-1 Related CVEs: CVE-2024-42472 https://launchpad.net/bugs/2077087 Upstream summary: It was discovered that Flatpak incorrectly handled certain persisted directories. An attacker could possibly use this issue to read and write files in […]

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Ubuntu 20.04 — znc — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — znc — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 23 December 2024 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6990-1 Related CVEs: CVE-2024-39844 Upstream summary: Johannes Kuhn (DasBrain) discovered that znc incorrectly handled user input under certain operations. An attacker could possibly use this issue to execute arbitrary code […]

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How to Install and Configure Xdebug 3 for PHP 8.3 on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Install CodeIgniter 4 on Ubuntu 24.04

CodeIgniter 4 is a lightweight, fast PHP framework ideal for developers who want a simple MVC structure without heavy overhead. This guide installs CodeIgniter 4 on Ubuntu 24.04 LTS with Nginx and PHP 8.3. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Nginx, PHP 8.3-FPM installed Composer installed Step 1 – […]

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Common Problems 117002

Ubuntu 22.04 SSH connection refused

🟡 Medium   ⏱ 5–30 min  Last verified: 22 December 2024 📖 ~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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Common Problems 116549

Ubuntu 24.04 LTS systemd Service Fails with Exit Code 203 EXEC

🟡 Medium   ⏱ 5–30 min  Last verified: 22 December 2024 📖 ~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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