Troubleshooting

Oracle Linux 8 — ghostscript — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — ghostscript — vulnerability — patch and remediation guide (ELSA-2019-3890)

🟠 High   ⏱ 15–60 min  Last verified: 13 July 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-3890 Related CVEs: CVE-2019-14869 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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How to Configure Networking with /etc/network/interfaces on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Networking with /etc/network/interfaces on Debian 10

Introduction How to Configure Networking with /etc/network/interfaces on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster 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 10. […]

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Common Problems 121538

TLS Handshake Errors From Outdated CA Certificates

🟠 High   ⏱ 5–30 min  Last verified: 12 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 117456

Ubuntu 20.04 LTS – SSH key authentication fails after hardening changes – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 12 July 2020 Affected versions: Ubuntu 20.04 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 Install OpenJDK 11 on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install OpenJDK 11 on Debian 10

Introduction Deploying install openjdk 11 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 Before you begin, […]

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Alpine Linux edge — snmptt — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — snmptt — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.4.2-r0 📖 ~4 min read  •  Source: Alpine secdb entry — snmptt 1.4.2-r0 Related CVEs: CVE-2020-24361 Upstream summary: Alpine main repository for vedge ships snmptt 1.4.2-r0 which addresses CVE-2020-24361. Table of contents Symptom & Impact Environment […]

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Ubuntu 18.04 — linux-aws-5.0 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — linux-aws-5.0 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 12 July 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4301-1 Related CVEs: CVE-2019-19053 CVE-2019-19056 CVE-2019-19058 CVE-2019-19059 CVE-2019-19066 CVE-2019-19068 CVE-2019-3016 CVE-2020-2732  +12 more Upstream summary: It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes […]

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How to Set Up Extended Security Updates for Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Set Up Extended Security Updates for Windows Server 2016

How to Set Up Windows Server 2016 Extended Security Updates Windows Server 2016 reached its end of mainstream support in January 2022, and Microsoft has defined its end of extended support as January 12, 2027. When a Windows Server version reaches end of extended support, it no longer receives free security updates, leaving systems vulnerable […]

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openSUSE Tumbleweed — libseccomp2 — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libseccomp2 — 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-2019:2280-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-9893 Upstream summary: libseccomp before 2.4.0 did not correctly generate 64-bit syscall argument comparisons using the arithmetic operators (LT, GT, LE, GE), which might able […]

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Ubuntu 20.04 — libssh2 — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libssh2 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 12 July 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6371-1 Related CVEs: CVE-2020-22218 Upstream summary: It was discovered that libssh2 incorrectly handled memory access. An attacker could possibly use this issue to cause a crash. Table of contents Symptom […]

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