ubuntu-26-04

How to Secure MySQL 9 on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Install MongoDB 8 on Ubuntu 26.04

MongoDB is a leading NoSQL document database that stores data as flexible JSON-like BSON documents. MongoDB 8 introduces improved aggregation performance, enhanced time series collections, and better sharding. This guide installs MongoDB 8 Community Edition on Ubuntu 26.04 LTS. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS server A user with sudo […]

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Common Problems 116045

Ubuntu 26.04 LTS – Journald disk usage grows uncontrollably – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 8 July 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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Common Problems 116058

ufw default deny blocks outbound package mirrors

🟠 High   ⏱ 5–30 min  Last verified: 8 July 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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Common Problems 116138

Ubuntu 26.04 LTS – cron jobs skip execution due to wrong timezone and PATH – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 7 July 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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Common Problems 115917

netplan apply drops SSH connectivity on reboot

🟠 High   ⏱ 5–30 min  Last verified: 7 July 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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How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Harden SSH on Ubuntu 26.04

SSH is the primary remote administration protocol for Linux servers. A default SSH configuration leaves many attack vectors open: root login, password authentication, and broad listening options. This guide hardens SSH on Ubuntu 26.04 LTS using key-based authentication, restricted access, and fail2ban. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS SSH access […]

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Common Problems 115932

Ubuntu 26.04 LTS – netplan apply does not update DNS settings – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 7 July 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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Common Problems 116008

time drift breaks TLS and apt repository access

🟠 High   ⏱ 5–30 min  Last verified: 6 July 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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How to Configure Unattended Upgrades on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

Initial Server Setup with Ubuntu 26.04 LTS

After spinning up a fresh Ubuntu 26.04 LTS server, a few essential steps harden the system, create a non-root administrative account, and prepare it for production workloads. This guide walks through every step from first login to a locked-down, up-to-date server. Tested and valid on: Ubuntu 26.04 LTS Prerequisites A fresh Ubuntu 26.04 LTS server […]

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Common Problems 116066

Snap Applications Fail to Launch or Mount

🟡 Medium   ⏱ 5–30 min  Last verified: 6 July 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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