Ubuntu 16.04

Common Problems 118492

Ubuntu 16.04 Cloud-Init Rewrites Network Settings Unexpectedly

🟡 Medium   ⏱ 5–30 min  Last verified: 8 September 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 & Cross-Refs References & Further […]

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Common Problems 118406

Ubuntu 16.04 LTS – dist-upgrade aborts with held broken packages

🟠 High   ⏱ 5–30 min  Last verified: 5 September 2019 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

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Ubuntu 16.04 — sigil — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — sigil — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 September 2019 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4085-1 Related CVEs: CVE-2019-14452 Upstream summary: Mike Salvatore discovered that Sigil mishandled certain malformed EPUB files. An attacker could use this vulnerability to write arbitrary files to the filesystem. Table […]

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Ubuntu 16.04 — squirrelmail — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — squirrelmail — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 2 September 2019 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4669-1 Related CVEs: CVE-2019-12970 Upstream summary: It was discovered that a cross-site scripting (XSS) vulnerability in SquirrelMail allows remote attackers to use malicious script content from HTML e-mail to execute […]

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How To Install Icinga and Icinga Web on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Install Icinga and Icinga Web on Ubuntu 16.04

Icinga is a flexible and powerful open-source monitoring system used to oversee the health of networked hosts and services. This tutorial will cover installing the Icinga core, its database backend, and the Icinga Web interface. Finally, we’ll set up email notification so you can receive alerts in your inbox when a service is misbehaving.

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Common Problems 118402

Ubuntu 16.04 LTS – apt update fails with Release file not valid yet – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 31 August 2019 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 118551

Ubuntu 16.04 LTS – black screen after installing NVIDIA driver – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 August 2019 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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Ubuntu 16.04 — apparmor — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — apparmor — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 30 August 2019 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4008-2 Related CVEs: CVE-2019-11190 https://launchpad.net/bugs/1788929 https://launchpad.net/bugs/1794848 CVE-2017-6507 Upstream summary: USN-4008-1 fixed multiple security issues in the Linux kernel. This update provides the corresponding changes to AppArmor policy for correctly operating […]

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Common Problems 118394

Ubuntu 16.04 LTS apt update fails with NO_PUBKEY errors

🟡 Medium   ⏱ 5–30 min  Last verified: 29 August 2019 Affected versions: 16.04 16.04.7 📖 ~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 118612

Ubuntu 16.04 LTS – sudo fails due to incorrect /etc/sudoers permissions – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 25 August 2019 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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