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Ubuntu 26.04 LTS Resolute Raccoon: The Complete Guide

Everything you need to know about Canonical's latest long-term support release.

This book is 100% completeLast updated on 2026-07-13

Whether you're upgrading, deploying, or simply exploring Ubuntu 26.04 LTS, this book is your essential guide to Canonical's most ambitious long-term support release. From installation and desktop features to security, performance, and enterprise deployment, it provides clear, practical coverage of everything you need to get the most from Ubuntu.

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About

About

About the Book

This book is a complete reference for Ubuntu 26.04 LTS, codenamed Resolute Raccoon. Released on April 23, 2026, this is the eleventh long-term support release in Ubuntu's history and one of the most technically ambitious yet. It brings GNOME 50 with a Wayland-only desktop session, Linux kernel 7.0, Rust-based core utilities and sudo, systemd 259 with mandatory cgroup v2, TPM-backed full-disk encryption, post-quantum cryptography defaults in OpenSSH and OpenSSL, and native NVIDIA CUDA and AMD ROCm support. It is designed for five years of standard support (through April 2031) and up to ten years with Ubuntu Pro.

Author

About the Author

Steve Publications

Steve is a technology professional with more than 20 years of experience in software development, server infrastructure, cybersecurity, vulnerability research and reverse engineering. Throughout his career, he has designed, secured, analyzed and tested complex software and infrastructure, with a particular focus on understanding how systems fail and how they can be made more secure.

Outside of work, Steve enjoys sharing knowledge with the technology community. He collaborates with researchers, industry experts and technology professionals to write practical books covering software development, cybersecurity, cloud computing, networking, DevOps, artificial intelligence and enterprise technologies. His books focus on practical learning through clear explanations, real-world examples and hands-on exercises. With more than two decades of industry experience, his goal is to help IT professionals, students and technology enthusiasts build useful skills and stay current in a rapidly changing industry.

We believe readers deserve to know how our books are created. Most of our authors are not native English speakers, so we use AI to help translate, proofread manuscripts, fix grammar, improve sentence structure and make technical explanations easier to read. AI is used as an editing tool only. It does not replace the research, technical knowledge or hands-on experience behind our books. Some of our authors also prefer to remain anonymous for privacy or professional reasons. In those cases, we publish their work under a different name. The author's name may be different, but the quality of the content and our review process remain the same.

Every book is written, reviewed and maintained by experienced technology professionals, with contributions from our private technical community of more than 400 engineers and researchers from Ukraine, Belarus and Russia. We spend far more time validating technical accuracy and keeping our content up to date than generating text. We are always interested in working with experienced professionals who have deep expertise in a particular technology or domain. If you would like to publish a book with us or help review an existing manuscript, we'd love to hear from you. Send us a message describing your area of expertise. We are especially interested in niche technologies, specialized skills and emerging topics that are underrepresented in existing technical literature.

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Contents

Table of Contents

Introduction: Why Ubuntu 26.04 Matters

Chapter 1: What Is Ubuntu 26.04 LTS?

  1. Ubuntu’s History and Philosophy
  2. What Does LTS Mean?
  3. The Resolute Raccoon Story
  4. Key Themes of This Release
  5. How to Read This Book
  6. Chapter Summary

Chapter 2: System Requirements and Installation

  1. Hardware Minimums and Recommended Specs
  2. Downloading ISOs and Verifying Checksums
  3. Creating Bootable Media
  4. The Subiquity Installer Walkthrough
  5. Dual-Boot Scenarios with BitLocker Windows
  6. Server Installation (Minimal, Virtual Machine Guest, Cloud-Init)
  7. Cloud Images: AWS, Azure, GCP, Oracle Cloud, IBM Cloud
  8. Post-Install Setup
  9. Chapter Summary

Chapter 3: First Boot and Desktop Experience

  1. Initial Setup Wizard and Ubuntu Pro Enrollment
  2. GNOME 50 Desktop Overview
  3. The Yaru Theme Updates
  4. New Default Applications
  5. Wayland Session and XWayland Compatibility
  6. Accessibility Features
  7. Snap Permissions Prompting and Security Center
  8. Configuring Your Desktop
  9. Chapter Summary

Chapter 4: Command-Line Fundamentals

  1. The Shell: Bash and Ptyxis
  2. Essential Commands
  3. The File System Hierarchy
  4. Permissions and Ownership
  5. Package Management with APT 3
  6. Rust-Based Core Utilities (uutils)
  7. sudo-rs: Memory-Safe Privilege Escalation
  8. Text Processing and Pipes
  9. Shell Scripting Basics
  10. Chapter Summary

Chapter 5: System Administration Essentials

  1. User and Group Management
  2. systemd 259: Services, Units, and cgroup v2
  3. Logging and Log Analysis
  4. Cron and Scheduled Tasks
  5. Network Configuration with Netplan 1.2
  6. Chrony NTP
  7. Storage Management
  8. System Monitoring and Sysprof
  9. Chapter Summary

Chapter 6: Security Hardening

  1. Ubuntu’s Security Model Overview
  2. TPM-Backed Full-Disk Encryption (TPM/FDE)
  3. AppArmor Mandatory Access Control
  4. Firewall Configuration: nftables and UFW
  5. SSH Hardening with OpenSSH 10.2
  6. Security Updates and Livepatch
  7. Compliance: CIS Benchmarks, HIPAA, SOC 2
  8. Chapter Summary

Chapter 7: Networking and Services

  1. Network Stack Fundamentals
  2. DNS with systemd-resolved
  3. DHCP Server Configuration
  4. Web Servers: Nginx and Apache HTTPD
  5. Mail Infrastructure: Postfix and Dovecot
  6. File Sharing: Samba 4.23
  7. Proxy and Caching: Squid 7.2
  8. Load Balancing with HAProxy 3.2
  9. Chapter Summary

Chapter 8: Virtualization and Containers

  1. QEMU/KVM Virtualization Fundamentals
  2. libvirt and virsh Management
  3. LXC/LXD Containers
  4. Docker and containerd (Dual-Track Updates)
  5. Podman and toolbox/distrobox
  6. Confidential Computing: Intel TDX and AMD SEV-SNP
  7. Chapter Summary

Chapter 9: Cloud Infrastructure

  1. Cloud-Init: The Backbone of Cloud Instances
  2. Ubuntu Images Across Cloud Platforms
  3. Ubuntu Pro for Cloud Subscriptions
  4. Multi-Cloud Management and Portability
  5. Infrastructure as Code: Terraform and Pulumi
  6. Cost Optimization Strategies
  7. Auto-Scaling with Kubernetes on Cloud
  8. Chapter Summary

Chapter 10: Development Workflow

  1. Language Toolchains
  2. Python 3.14
  3. Rust Development
  4. Go 1.25
  5. Node.js and JavaScript Tooling
  6. Java/OpenJDK 25
  7. AI/ML: NVIDIA CUDA, AMD ROCm, Intel DPC++/SYCL
  8. IDEs and Code Editors
  9. Git Workflows and Code Review
  10. Chapter Summary

Chapter 11: Troubleshooting and Diagnostics

  1. The Troubleshooting Mindset
  2. Boot Process and Initramfs (Dracut)
  3. Kernel Crash Dumps (kdump)
  4. Journalctl and Log Analysis
  5. Network Debugging
  6. Filesystem Repair and fsck
  7. Recovery: Live USB, Chroot, and Rescue Mode
  8. Chapter Summary

Chapter 12: Performance Tuning and Optimization

  1. Understanding System Performance Bottlenecks
  2. CPU Scheduling and Low-Latency Kernels
  3. Memory Management and Swap Tuning
  4. Disk I/O Optimization
  5. Network Performance Tuning with sysctl
  6. systemd Performance Optimization
  7. amd64v3 Architecture Variants
  8. Profile-Guided Optimization with Sysprof
  9. Chapter Summary

Chapter 13: Customization and Flavors

  1. GNOME Customization
  2. Alternative Desktop Environments
  3. Building Custom Ubuntu Images
  4. Ubuntu Core and Immutable Systems
  5. Official Flavors Overview
  6. Enterprise Customization with Landscape
  7. Chapter Summary

Chapter 14: Enterprise Deployment and Management

  1. Ubuntu Pro: ESM, FIPS, Livepatch, Compliance
  2. Canonical Livepatch for Zero-Downtime Kernel Patches
  3. Landscape: Fleet Management and Monitoring
  4. Cloud Authentication with authd (Google IAM, Entra ID, OIDC)
  5. Active Directory Integration with ADSys
  6. Patch Management and Compliance Automation
  7. Security Incident Response and Forensics
  8. Chapter Summary

Conclusion: The Road Ahead

References

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