Embracing the Next Decade: Ubuntu 26.04 LTS Upgrade in Practice

Honestly, I’ve been itching to do this. Ubuntu 26.04 LTS (Resolute Raccoon) dropped, and the moment I heard the news I couldn’t hold back. As an ops engineer, I’ve always been cautious about LTS upgrades—stability comes first in production, after all. But this time, several core improvements made me feel it’s worth a serious discussion: Linux 7.0 kernel, Rust’s first integration into the kernel ecosystem, Wayland by default, and TPM full-disk encryption. Especially from the perspective of our insurtech industry, these changes directly impact observability, security compliance, and cost control.

Over the weekend, I ran an upgrade validation on my decade-old ASUS UX305LA laptop (it really can’t handle Windows 11 anymore…) and documented the entire process. If you’re also itching to upgrade, or evaluating an enterprise upgrade strategy (for enterprise upgrades, it’s better to wait for 26.04.1 when the official upgrade channel opens—should be around August this year), this article should help.

Why Is It Worth Upgrading?

Before jumping to the upgrade steps, let’s look at what Ubuntu 26.04 LTS actually brings. Honestly, this isn’t a minor patch—it’s a foundational infrastructure overhaul for the next decade.

Core Improvement	Impact Area	My Take
Linux 7.0 Kernel + Rust in Core	Security, Performance, Maintainability	Rust entering the kernel ecosystem is a milestone
Wayland by Default (X11 No Longer Optional)	GUI and Remote Desktop Experience	Finally saying goodbye to screen tearing
TPM Full-Disk Encryption + Confidential Computing	Security Compliance, Especially Finance	This is a must-have for insurtech
Intel Panther Lake / Xe3 Graphics / NPU Optimization	AI Workloads	AI performance boost, promising future
Support Extended to 2036 (with Pro)	Long-term Ops Stability	Ten years worry-free, ideal for enterprises

│ 📝Notes: Regarding “Wayland by default”—note that some legacy GPU drivers may have compatibility issues. If you experience UI stuttering, check your driver version first. NVIDIA users need driver version 470+.

Upgrading from Ubuntu 24.04 LTS to 26.04 LTS: Seven Steps to Success

I chose the most reliable upgrade approach—the standard do-release-upgrade tool, following the official LTS-to-LTS upgrade path. The entire process takes about 1–2 hours depending on your network speed and number of packages. Here’s my seven-step upgrade method:

Step 1: Back Up Your Data

This has to be step one. Any mishap during the upgrade (power loss, network drop, disk failure) could lead to data loss. On my laptop I used Timeshift (based on rsync under the hood) as insurance. For the K3s node on the laptop, I stopped all Pods and did a full etcd backup with K3s etcd-backup + Velero.

# Back up important directories (commands are for reference only; you can have AI generate a comprehensive backup script for your situation)
sudo tar -czf /backup/home_backup_$(date +%Y%m%d).tar.gz /home
sudo tar -czf /backup/etc_backup_$(date +%Y%m%d).tar.gz /etc

# If using configuration management tools, back up their state
# e.g., Timeshift/Velero/volsync/restic etc.

Step 2: Check Disk Space and Current Version

# Confirm current version
lsb_release -a
# Output should include "Ubuntu 24.04 LTS"

# Check disk space
df -h
# You need at least 5-10 GB free; the upgrade downloads a lot of packages

Step 3: Update the Existing System to Latest

# Update package index and upgrade all packages
sudo apt update && sudo apt upgrade -y && sudo apt dist-upgrade -y

# Clean up unnecessary packages
sudo apt autoremove --purge -y
sudo apt autoclean

│ 🐾 Note: If you’re running containers with K3s or Docker, it’s recommended to stop all container services first to avoid potential conflicts during the upgrade. Last time I forgot to stop containers and spent half an hour dealing with conflicts—don’t be like me.

# Stop Docker or K3s containers
sudo systemctl stop docker
sudo systemctl stop k3s

Step 4: Back Up Package Sources

Before upgrading, I always back up the system’s sources.list for easy rollback. (The Ubuntu upgrader will also back it up for you.)
Additionally, if some software sources don’t have a corresponding 26.04 repository yet, you can use mv to back them up first.

# For reference only; adjust commands based on your actual setup
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

sudo mv /etc/apt/sources.list.d/winehq.sources /etc/apt/sources.list.d/winehq.sources.bak

Step 5: Execute the Upgrade

# Install update-manager-core
sudo apt install update-manager-core -y

# Start the upgrade
sudo do-release-upgrade -d

I noticed that do-release-upgrade -d requires the -d flag to detect 26.04 LTS, because Canonical marks 26.04 as devel until the first point release. Once the official version (e.g., 26.04.1) is released (around August this year), you can run do-release-upgrade directly. If prompted to reboot during the upgrade, select “Yes”.

│ 📝Notes: During the upgrade you’ll be asked whether to restart services (such as sshd, Docker, K3s). It’s recommended to select “No” and restart everything together after all packages are upgraded. Otherwise, a service restarting early might interfere with subsequent package installations.

Step 6: Reboot and Verify

sudo reboot

# After reboot, confirm the version
lsb_release -a

When you see Description: Ubuntu 26.04 LTS, the upgrade was successful.

Step 7: Restore Docker/K3s and Check Compatibility

sudo systemctl start docker
sudo systemctl start k3s

# Confirm all Pods are running normally
kubectl get pods --all-namespaces

In my case, K3s + Traefik + Cilium all started normally with no compatibility issues. However, if your environment has legacy hardware drivers (such as certain Wi-Fi adapters), the new kernel might cause problems. I recommend checking the Linux 7.0 kernel hardware support list in advance.

Core Value of New Features

After completing the upgrade, I took a deeper look at several core improvements.

Wayland Enabled by Default: This is particularly useful in observability scenarios. Previously with X11, when running Grafana/Prometheus remote workflows with heavy traffic, screen tearing was the norm. Wayland completely solves this problem. Additionally, Wayland has a friendlier security model—each window is isolated, making keylogging much harder.

TPM Full-Disk Encryption: For insurtech companies, this is a compliance game-changer. In the past, full-disk encryption required manual LUKS configuration. Now you can leverage the TPM 2.0 chip directly—automatic decryption at boot, transparent to ops. If you’re running Ubuntu 26.04 on public cloud, you can combine it with SDKs (like AWS Nitro) for confidential computing—sensitive business data stays encrypted throughout its entire lifecycle.

Rust and Linux 7.0 Kernel: Rust’s integration into the kernel ecosystem means significantly improved safety for future kernel modules. For us ops engineers, kernel Oops and memory leak issues will be much less frequent. Combined with Intel Xe3 graphics and NPU optimizations, I plan (when I can afford it and hardware prices drop) to run some AI model inference experiments on my HomeLab to validate enterprise AI cost optimization possibilities.

│ 📝Notes:
│ If you’re an enterprise user, subscribing to Ubuntu Pro gives you 10 years of ESM updates. I recommend registering for a Pro subscription after completing the upgrade, especially for PCI-DSS and HIPAA compliance scenarios where ESM patch coverage is broader.
│ Regular users can register an Ubuntu One account and get 5 free Ubuntu Pro subscriptions—more than enough for a Homelab.
│ Homelab security is still very important, especially in the AI era where 0-day vulnerabilities are rampant. Also, just recently Linux had a major vulnerability—Copy Fail (732 bytes, 1-second root, unknown for nine years).
│ Latest trend: Once AI can read open-source code, it becomes very easy to find vulnerabilities. The sword is extremely sharp right now, and the shield can only try to keep up. Pro’s livepatch barely counts as a shield.

After All This Tinkering, Here Are My Thoughts

Overall, Ubuntu 26.04 LTS is worth upgrading to. For production environments, I recommend waiting until the first point release (26.04.1) before doing a unified upgrade. For personal HomeLabs or test environments, you can go all-in right now.

From my personal experience, this upgrade process was smoother than the Ubuntu 24.04 upgrade, with no major obstacles. The only hiccup was discovering mid-upgrade that some partitions were too small, but I resolved it by manually resizing them.

For the insurtech industry, TPM full-disk encryption and confidential computing support allow us to meet regulatory compliance while reducing infrastructure costs. The Rust kernel ecosystem also provides a better foundation for future security hardening.

That’s my complete upgrade journey—hope it helps. If you’ve also upgraded, feel free to share your war stories.

📚️References

1. Canonical releases Ubuntu 26.04 LTS Resolute Raccoon | Canonical
2. How to Upgrade from Ubuntu 24.04 LTS to 26.04 LTS (Upgrade steps reference)
3. Ubuntu 26.04 LTS “Resolute Raccoon” Officially Released: An OS Innovation for the Next Decade (New features overview)