Linux

Common Problems 118949

Ubuntu 14.04 LTS – DNS resolution fails after network changes

🟠 High   ⏱ 5–30 min  Last verified: 30 November 2021 Affected versions: Ubuntu 14.04 LTS Ubuntu 14.04 Ubuntu 14.04.6 📖 ~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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Common Problems 118574

Ubuntu 16.04 LTS rsyslog stops writing logs after permission regression

🟠 High   ⏱ 5–30 min  Last verified: 30 November 2021 Affected versions: 16.04 📖 ~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 […]

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AlmaLinux 8 — polkit — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — polkit — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2022:0267 Related CVEs: CVE-2021-4034 CVE-2021-4115 Upstream summary: The polkit packages provide a component for controlling system-wide privileges. This component provides a uniform and organized way for non-privileged processes to communicate with privileged […]

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Common Problems 115096

RHEL 8 sudo Access Broken By Invalid sudoers Include File

🟡 Medium   ⏱ 5–30 min  Last verified: 30 November 2021 📖 ~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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How to Set Up Dante Proxy for Private Connections on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How to Set Up Dante Proxy for Private Connections on Ubuntu 20.04

Proxy servers are a useful way of caching or obfuscating web traffic. This means that web requests can be served from different inbound or outbound addresses than they appear to be, by offloading the connection to intermediaries. For regular end users, this usually means allowing you to make web requests from a different IP address than your own. In this tutorial, you will be installing and configuring Squid to support a number of popular proxy protocols on a Ubuntu 20.04 server.

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How To Back Up an Ubuntu 14.04 Server with Bacula — step-by-step Linux tutorial on Progressive Robot

How To Back Up an Ubuntu 14.04 Server with Bacula

This tutorial will show you how to set up Bacula to create backups of a remote Ubuntu 14.04 host over a network connection. This involves installing and configuring the Bacula Client software on a remote host, and making some additions to the configuration of an existing Bacula Server.

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Debian 11 — varnish — multiple vulnerabilities (19 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — varnish — multiple vulnerabilities (19 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 30 November 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2009-2936 CVE-2009-4488 CVE-2013-4090 CVE-2013-4484 CVE-2015-8852 CVE-2017-12425 CVE-2017-8807 CVE-2019-15892  +11 more Upstream summary: The Command Line Interface (aka Server CLI or administration interface) in the master process in the […]

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Debian 11 — tiemu — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — tiemu — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 November 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2016-20040 CVE-2017-20225 Upstream summary: TiEmu 3.03-nogdb+dfsg-3 contains a buffer overflow vulnerability in the ROM parameter handling that allows local attackers to crash the application or execute arbitrary code. […]

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Oracle Linux 8 — emacs — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — emacs — security and stability fixes — required update (ELSA-2023-3042)

🟡 Medium   ⏱ 10–30 min  Last verified: 29 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-3042 Related CVEs: CVE-2022-45939 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 121571

Debian 9 – ext4 Filesystem Remounts Read-Only – Root Cause and Repair

🔴 Critical   ⏱ 5–30 min  Last verified: 29 November 2021 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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