Ubuntu 20.04

Common Problems 117424

Ubuntu 20.04 LTS Netplan Apply Drops SSH Connectivity

🟡 Medium   ⏱ 5–30 min  Last verified: 4 December 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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Ubuntu 20.04 — libxml-security-java — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libxml-security-java — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 December 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5525-1 Related CVEs: CVE-2021-40690 Upstream summary: It was discovered that Apache XML Security for Java incorrectly passed a configuration property when creating specific key elements. This allows an attacker to […]

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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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Common Problems 117409

Ubuntu 20.04 no sound output on speakers or headset

🟡 Medium   ⏱ 5–30 min  Last verified: 29 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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Ubuntu 20.04 — wayland — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — wayland — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 28 November 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5614-1 Related CVEs: CVE-2021-3782 Upstream summary: It was discovered that Wayland incorrectly handled reference counting certain objects. An attacker could use this issue to cause Wayland to crash, resulting in […]

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How To Install WordPress on Ubuntu 20.04 with a LAMP Stack — step-by-step Linux tutorial on Progressive Robot

How To Install WordPress on Ubuntu 20.04 with a LAMP Stack

WordPress is an extremely popular open-source technology and WordPress sites represent 36% of all websites that are currently online. This tutorial is intended for those who are comfortable with system administration or for those who are interested in learning how to administer your own WordPress instance on the server side. In this guide, we’ll install and set up WordPress via LAMP on a Linux Ubuntu 20.04 server.

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Установка комплекта Linux, Nginx, MySQL, PHP (LEMP) в Ubuntu 20.04 [Краткое руководство] — step-by-step Linux tutorial on Progressive Robot

Установка комплекта Linux, Nginx, MySQL, PHP (LEMP) в Ubuntu 20.04 [Краткое руководство]

В этом кратком руководстве мы расскажем об установке комплекта LEMP на сервере под управлением Ubuntu 20.04. Более подробную информацию с разъяснениями каждого шага можно найти в [обучающем модуле «Установка комплекта Linux, Nginx, MySQL, PHP (LEMP) на сервере Ubuntu…

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How To Secure MongoDB on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Secure MongoDB on Ubuntu 20.04

MongoDB doesn’t have authentication enabled by default, meaning that any user with access to the server where the database is installed can add and delete data without restriction. In order to secure this vulnerability, this tutorial will walk you through creating an administrative user and enabling authentication. You’ll then test to confirm that only this administrative user has access to the database.

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