Linux

Common Problems 118563

Ubuntu 16.04 LTS – service fails due to missing systemd unit dependency – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 20 October 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 118390

Ubuntu 16.04 LTS Stuck at GRUB Prompt After Kernel Cleanup

🟠 High   ⏱ 5–30 min  Last verified: 20 October 2020 Affected versions: 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 117572

Ubuntu 20.04 LTS Cron Jobs Not Running Under systemd Timers

🟡 Medium   ⏱ 5–30 min  Last verified: 20 October 2020 Affected versions: 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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Ubuntu 20.04 — wavpack — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — wavpack — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 20 October 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4682-1 Related CVEs: CVE-2020-35738 Upstream summary: It was discovered that WavPack incorrectly handled certain WAV files. An attacker could possibly use this issue to execute arbitrary code or cause a […]

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

Oracle Linux 8 — thunderbird — vulnerability — patch and remediation guide (ELSA-2020-4155)

🟠 High   ⏱ 15–60 min  Last verified: 20 October 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4155 Related CVEs: CVE-2020-15677 CVE-2020-15673 CVE-2020-15676 CVE-2020-15678 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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[Краткое руководство] по установке Nginx в Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

[Краткое руководство] по установке Nginx в Ubuntu 18.04

Nginx — один из самых популярных в мире веб-серверов, на базе которого размещены некоторые из самых крупных сайтов интернета с огромным трафиком. Обычно он использует ресурсы эффективнее, чем Apache, и может использоваться как веб-сервер или обратный прокси-сервер. В этом…

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How To Harden OpenSSH Client on Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

How To Harden OpenSSH Client on Ubuntu 18.04

Linux servers are often administered remotely using SSH by connecting to an OpenSSH server, which is the default SSH server software used within Ubuntu, Debian, CentOS, FreeBSD, and most other Linux/BSD-based systems. Significant effort is put into securing the server-side aspect of SSH, as SSH acts as the entry into your server. In this tutorial, you will harden your OpenSSH client in order to help ensure that outgoing SSH connections are as secure as possible.

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