Backup Recovery

Common Problems 115431

Chronyd Time Drift Causing TLS and Repository Failures

🟡 Medium   ⏱ 5–30 min  Last verified: 18 August 2019 📖 ~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 118466

Ubuntu 16.04 LTS – GRUB rescue prompt appears after update

🔴 Critical   ⏱ 5–30 min  Last verified: 17 August 2019 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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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How to Configure Swap Space on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Swap Space on Debian 9

Introduction How to Configure Swap Space on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 9. This […]

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Common Problems 113548

Windows Server 2012 R2 — .NET Framework 4.8 install fails or repair leaves applications broken — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 17 August 2019 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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How to Configure a RADIUS Server with NPS on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure a RADIUS Server with NPS on Windows Server 2016

How to Set Up Windows Server 2016 NPS RADIUS Network Policy Server (NPS) is the Microsoft implementation of a RADIUS (Remote Authentication Dial-In User Service) server and proxy. NPS provides centralized authentication, authorization, and accounting (AAA) for network access requests, including VPN connections, 802.1X wireless and wired authentication, dial-up, and remote access through RRAS. By […]

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How to Install MariaDB on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install MariaDB on RHEL 8

MariaDB is a community-developed, fully open-source relational database management system that was forked from MySQL and remains highly compatible with it. On RHEL 8, MariaDB is conveniently available through the AppStream module system, allowing you to install a specific stream version without adding third-party repositories. This tutorial covers installing MariaDB 10.5 via AppStream, starting and […]

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How to Configure Bacula Backup on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure Bacula Backup on FreeBSD 12

Introduction How to Configure Bacula Backup on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet filtering, […]

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How to Install Composer on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install Composer on FreeBSD 12

Introduction Deploying install composer on freebsd 12 on a FreeBSD 12 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

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Common Problems 118508

Permission denied (publickey) for valid SSH user

🟡 Medium   ⏱ 5–30 min  Last verified: 14 August 2019 📖 ~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 118436

Ubuntu 16.04 LTS – DHCP lease does not renew on reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 14 August 2019 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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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