Troubleshooting

Common Problems 118400

Ubuntu 16.04 apt lock errors during updates

🟡 Medium   ⏱ 5–30 min  Last verified: 11 September 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 […]

Read more
SLES 12 — libproxy1 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — libproxy1 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 September 2020 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2020:518-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-25219 CVE-2020-26154 CVE-2012-4504 Upstream summary: url::recvline in url.cpp in libproxy 0.4.x through 0.4.15 allows a remote HTTP server to trigger uncontrolled recursion via a response […]

Read more
Common Problems 117444

Ubuntu 20.04 LTS NO_PUBKEY Repository Signature Error

🟡 Medium   ⏱ 5–30 min  Last verified: 11 September 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 […]

Read more
How to Configure NTP on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure NTP on IBM AIX 7.1

Introduction IBM AIX 7.1 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 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure ntp on ibm aix 7.1 on IBM AIX […]

Read more
How to Install Apache2 on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Apache2 on Debian 10

Introduction How to Install Apache2 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. This tutorial […]

Read more
Oracle Linux 8 — redis:5 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — redis:5 — vulnerability — patch and remediation guide (ELSA-2019-2002)

🟠 High   ⏱ 15–60 min  Last verified: 11 September 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-2002 Related CVEs: CVE-2019-10193 CVE-2019-10192 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

Read more
Debian 10 — bluez — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — bluez — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 11 September 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-0556 CVE-2020-26558 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

Read more
How to Configure Bridge Networking on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Bridge Networking on RHEL 7

How to Configure Bridge Networking on RHEL 7 A network bridge is a Layer 2 virtual switch that connects multiple network interfaces, allowing them to share a single network segment. On RHEL 7, bridge networking is essential for virtualization with KVM — virtual machine interfaces are typically attached to a bridge so VMs appear as […]

Read more
Common Problems 121543

Debian 9: /var fills up due to systemd journal growth

🟠 High   ⏱ 5–30 min  Last verified: 10 September 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 & […]

Read more
FreeBSD 12 — weechat — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — weechat — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 10 September 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: WeeChat — Multiple vulnerabilities Related CVEs: CVE-2012-5854 CVE-2017-14727 CVE-2017-8073 CVE-2020-8955 Upstream summary: The Weechat project reports: Multiple integer and buffer overflows in WeeChat core. Table of contents Symptom & Impact […]

Read more
CHAT