Common Problems

Common Problems 117392

Ubuntu 20.04 LTS APT Lock File Prevents Updates

🟡 Medium   ⏱ 5–30 min  Last verified: 17 August 2020 📖 ~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 115047

journalctl Shows No Persistent Logs After Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 17 August 2020 📖 ~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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Gentoo Linux — dev-java/oracle-jre-bin — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — dev-java/oracle-jre-bin — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202209-15 Related CVEs: CVE-2020-2585 CVE-2020-2755 CVE-2020-2756 CVE-2020-2757 CVE-2020-2773 CVE-2020-2781 CVE-2020-2800 CVE-2020-2803  +12 more Upstream summary: Multiple vulnerabilities have been discovered in Oracle's JDK and JRE software suites. Please review the CVE identifiers […]

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Common Problems 118531

Ubuntu 16.04 LTS – cloud-init stalls and delays first boot provisioning – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 16 August 2020 Affected versions: Ubuntu 16.04 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 117982

Netplan YAML Parse Error After Network Changes

🟡 Medium   ⏱ 5–30 min  Last verified: 16 August 2020 📖 ~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 115026

RHEL 8 Cockpit Web Console Unreachable On Port 9090

🟡 Medium   ⏱ 5–30 min  Last verified: 16 August 2020 📖 ~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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openSUSE Tumbleweed — python36-Flask-Cors — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — python36-Flask-Cors — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2020:1393-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-25032 Upstream summary: An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources […]

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

Ubuntu 20.04 — spice — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 16 August 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4572-1 Related CVEs: CVE-2020-14355 Upstream summary: Frediano Ziglio discovered that Spice incorrectly handled QUIC image decoding. A remote attacker could use this to cause Spice to crash, resulting in a […]

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Common Problems 112999

Windows Server 2016 – HNS fails to create container network after policy changes – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 16 August 2020 Affected versions: Windows Server 2016 📖 ~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 112608

Windows Server 2019 — WSUS Synchronization Stalls and New Security Updates Never Appear — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 16 August 2020 Affected versions: Windows Server 2019 📖 ~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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