Troubleshooting

Common Problems 121528

MySQL Service Refuses to Start After Crash Recovery

🔴 Critical   ⏱ 5–30 min  Last verified: 10 July 2020 Affected versions: Debian 9 📖 ~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 117447

Ubuntu 20.04 Snap Store Not Opening

🟡 Medium   ⏱ 5–30 min  Last verified: 10 July 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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Debian 10 — symfony — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — symfony — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 10 July 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-18887 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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Common Problems 112958

Windows Server 2016 – MPIO path failover stalls due to HBA driver defects – Fix and Prevention

🟠 High   ⏱ 5–30 min  Last verified: 10 July 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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How to Install and Configure Varnish Cache on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install and Configure Varnish Cache on Debian 9

Introduction How to Install and Configure Varnish Cache on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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How to Use AIX CDE Desktop on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Use AIX CDE Desktop on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use aix cde desktop on ibm aix 7.2 on […]

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Ubuntu 14.04 — ppp — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — ppp — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 10 July 2020 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4451-2 Related CVEs: CVE-2020-15704 CVE-2020-8597 CVE-2018-11574 CVE-2015-3310 CVE-2014-3158 Upstream summary: USN-4451-1 fixed a vulnerability in ppp. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. […]

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How to Configure DNSSEC Validation on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure DNSSEC Validation on Debian 10

Introduction Deploying configure dnssec validation on debian 10 on a Debian 10 Buster machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Ensure Debian 10 […]

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openSUSE Tumbleweed — cinnamon — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — cinnamon — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2021:1294-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-12825 Upstream summary: libcroco through 0.6.13 has excessive recursion in cr_parser_parse_any_core in cr-parser.c, leading to stack consumption. Table of contents Symptom & Impact Environment & […]

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Ubuntu 18.04 — libdbi-perl — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — libdbi-perl — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 10 July 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5030-1 Related CVEs: CVE-2014-10402 CVE-2020-14393 CVE-2019-20919 CVE-2020-14392 Upstream summary: It was discovered that the Perl DBI module incorrectly opened files outside of the folder specified in the data source name. […]

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