Linux

Common Problems 121073

Debian 10 – sudo fails in automation with no tty present

🟡 Medium   ⏱ 5–30 min  Last verified: 20 April 2020 Affected versions: Debian 10 📖 ~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 118942

Ubuntu 14.04 LTS SSH login fails with Permission denied publickey

🟠 High   ⏱ 5–30 min  Last verified: 20 April 2020 Affected versions: 14.04 📖 ~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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Arch Linux — mupdf-gl — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — mupdf-gl — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201805-5 Related CVEs: CVE-2018-6544 CVE-2018-6192 CVE-2018-6187 CVE-2018-5686 CVE-2018-1000051 CVE-2017-17858 CVE-2017-15587 CVE-2017-14687  +2 more Upstream summary: Type: multiple issues. Status: Fixed. Affected: 1.12.0-2. Fixed in: 1.13.0-1. Group: AVG-687. Table of contents […]

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How to Configure Pyenv for Multiple Python Versions on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Pyenv for Multiple Python Versions on Debian 9

Introduction This guide explains how to Configure Pyenv for Multiple Python Versions on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install […]

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How To Secure Apache with Let's Encrypt on CentOS 7 — step-by-step Linux tutorial on Progressive Robot

How To Secure Apache with Let’s Encrypt on CentOS 7

SSL certificates are used within web servers to encrypt the traffic between the server and client, providing extra security for users accessing your application. Let’s Encrypt provides an easy way to obtain and install trusted certificates for free.

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Ubuntu 14.04 — vcftools — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — vcftools — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 20 April 2020 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4835-1 Related CVEs: CVE-2018-11099 CVE-2018-11129 CVE-2018-11130 CVE-2019-1010127 Upstream summary: It was discovered that VCFtools improperly handled certain input. If a user were tricked into opening a crafted input file, VCFtools […]

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Arch Linux — neomutt — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — neomutt — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202011-24 Related CVEs: CVE-2020-28896 Upstream summary: Type: silent downgrade. Status: Fixed. Affected: 20200925-1. Fixed in: 20201120-1. Group: AVG-1289. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]

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How to Install Redis on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Redis on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up install redis on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and the resulting […]

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How To Enable SFTP Without Shell Access on CentOS 7 — step-by-step Linux tutorial on Progressive Robot

How To Enable SFTP Without Shell Access on CentOS 7

SFTP stands for SSH File Transfer Protocol. As its name suggests, it’s a secure way of transferring files to a server using an encrypted SSH connection. n a standard configuration, the SSH server grants file transfer access and terminal shell access to all users with an account on the system. In this tutorial, we’ll set up the SSH daemon to limit SFTP access to one directory with no SSH access allowed on per user basis.

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