ubuntu

Common Problems 117609

Ubuntu 20.04 Software Center not opening

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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 16.04 — libphp-adodb — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — libphp-adodb — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6825-1 Related CVEs: CVE-2016-4855 CVE-2016-7405 CVE-2021-3850 Upstream summary: It was discovered that the PDO driver in ADOdb was incorrectly handling string quotes. A remote attacker could possibly use this issue […]

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Common Problems 118542

Ubuntu 16.04 UFW Blocks Required Service Ports

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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 — libspf2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libspf2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6584-1 Related CVEs: CVE-2021-20314 CVE-2021-33912 CVE-2021-33913 Upstream summary: Philipp Jeitner and Haya Shulman discovered that Libspf2 incorrectly handled certain inputs. If a user or an automated system were tricked into […]

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Common Problems 118094

Ubuntu 18.04 VPN connection fails to establish

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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 116102

Ubuntu 26.04 LTS – pip install blocked by externally-managed-environment – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 26.04 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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Установка и настройка Postfix в Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

Установка и настройка Postfix в Ubuntu 18.04

Postfix — популярный почтовый агент (MTA) с открытым исходным кодом, который можно использовать для маршрутизации и доставки почты в системе Linux. Согласно оценкам, примерно 25% публичных почтовых серверов в Интернете используют Postfix. В этом обучающем модуле мы научим вас…

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