LINUX

Ubuntu 26.04 LTS: Canonical sets a new security bar

Canonical released Ubuntu 26.04 LTS, codenamed “Resolute Raccoon”, on April 23, 2026, marking the 11th extended support edition of the most widely deployed Linux distribution in enterprise infrastructures and cloud services. The release establishes full disk encryption anchored in TPM, post-quantum cryptography by default, and system tools rewritten in Rust as base configurations, with security becoming the default system state, without the need for manual administrator intervention.

For years, Linux distributions treated security as a layer to be activated during installation and rarely revisited. With Ubuntu 26.04 LTS, Canonical changes this logic: the new Security Center application transforms system protections into an inspectable and manageable surface after deployment, allowing administrators to review the TPM encryption status, Secure Boot configuration, and recovery mechanisms without the need for re-imaging.

Jon Seager, Vice President of Ubuntu Engineering at Canonical, defined resilience and memory security as the structuring priorities of this version. The technical argument is straightforward: most critical vulnerabilities in system software originate from memory management errors, and migrating to Rust eliminates this category of flaws by design of the language itself.

Regarding features implemented in Gnome specifically for Ubuntu 26.10, the left sidebar remains. The Ubuntu Dock, as it's called, now has an opaque background, no longer offering a translucent effect.

As always, there's also a new wallpaper package, which includes the default image referencing the codename of the new operating system version.

Another notable change is Showtime taking over as the system's default media player. The player has a minimalist look that, as such, makes it easier to use and tends to contribute to stability. Showtime was introduced in Gnome 49, but only now has it become the default in Ubuntu.

There are no other major visual changes, however, those with a more attentive eye will notice that the folders are no longer predominantly gray and have returned to being orange. Those who don't like this change can alter the color schemes in the system settings.

Another new feature—or "not new"—is the removal of the Software & Updates tool, which allowed users to update software and resources like drivers, but is now considered obsolete and insecure by Ubuntu developers. It's still possible to use this utility, but only if you install it manually.

The App Center, the distribution's official software manager, now officially handles Debian packages (.deb), not just Snaps.

This may please users who prefer to work directly with .deb packages, following the traditional approach. Snaps, it's worth noting, are a Canonical implementation that has the advantage of including each app's dependencies, but can be heavier or have slower startup times, among other potential disadvantages.

Base tools rewritten in Rust...The most visible replacement falls on utilities present in virtually all Linux systems. sudo-rs and uutils coreutils, Rust implementations of tools like sudo, ls, cp, and mv, become the default options. The original implementations in GNU coreutils and classic sudo remain available as a compatibility and fallback alternative, preserving operational continuity in environments with established dependencies.

Rust ensures memory safety by design, which eliminates vulnerabilities such as buffer overflows and use-after-free vulnerability (terms without established equivalents in Portuguese). For system administrators, the practical result is a reduced attack surface in the base utilities themselves, without altering the workflow. A relevant caveat: these implementations have a shorter production history than their classic C equivalents, justifying close monitoring during the initial production deployment cycles. [unverified data – requires editorial confirmation: comparative number of CVEs registered in sudo-rs versus classic sudo]

Post-quantum cryptography and hardware encryption...OpenSSH 10.2, included in this release, enables post-quantum hybrid key exchange mlkem768x25519-sha256 by default on all SSH connections, requiring no additional configuration. DSA support has been entirely removed, including DSA host key generation. Apache 2.4.66 disables TLS 1.0 and TLS 1.1 by default; Nginx 1.28.2 now only accepts TLS 1.2 and TLS 1.3, in accordance with RFC 8996, which deprecates older protocols.

Full disk encryption with TPM support has moved from experimental to general availability. The mechanism links encryption keys to the hardware's TPM chip and the Secure Boot state, making data extraction impossible without physical access to the original equipment. Canonical explicitly documents known incompatibilities, such as Absolute/Computrace, and kernel module requirements for certain storage configurations.

Ubuntu 26.04 LTS integrates full support, both in the host and guest systems, for AMD SEV-SNP and Intel TDX. These technologies allow running virtual machines with encrypted memory and processor-level integrity protection, being particularly relevant for public cloud providers, regulated industries, and artificial intelligence workloads with data sovereignty requirements.

In identity management, SSSD now runs as a dedicated user without privileges, abandoning execution as root. OpenLDAP operates in AppArmor application mode, with configurable PBKDF2 iteration control for password derivation. The version also introduces authd, an open-source authentication service that allows integrating Ubuntu systems with cloud identity providers, including Microsoft Entra ID and Google IAM, using OpenID Connect and supporting multifactor authentication.

Linux 7.0, GNOME 50, and the end of Xorg...This version includes the Linux 7.0 kernel and GNOME 50, completing the transition to Wayland as the only supported graphical environment in the LTS version. This is the first Ubuntu LTS version without an Xorg session as an alternative, with support for per-monitor scaling, native gestures, and the elimination of screen tearing. For most users, the transition is seamless; in enterprise environments with legacy software or hardware without full Wayland support, compatibility should be evaluated before any migration.

Canonical Livepatch, the service for applying kernel patches without system restarts, extends to Arm64 servers for the first time. For organizations running Ubuntu on Arm64 hardware, critical kernel updates will now be applied without service interruption. The official repositories will also include NVIDIA CUDA and AMD ROCm, the two dominant ecosystems in artificial intelligence and machine learning computing.

A platform for the next ten years...Standard support for this LTS release extends until April 2031, with extended coverage until 2036 for Ubuntu Pro subscribers. LTS cycles are the foundation upon which enterprises, governments, and cloud providers build infrastructure for consecutive years, amplifying the impact of every design decision made in this release.

The combination of post-quantum cryptography, hardware-bound cryptography, and system utilities with native memory security positions Ubuntu 26.04 LTS as a platform built for today's threat landscape, from ransomware to state espionage. Large-scale production over the next five years will tell if the maturity of sudo-rs and uutils coreutils in a full LTS cycle lives up to the confidence Canonical has placed in them.

FAQ:

-What is Ubuntu 26.04 LTS “Resolute Raccoon”?

Ubuntu 26.04 LTS, codenamed “Resolute Raccoon”, is the 11th extended support version of Canonical's Linux distribution, released on April 23, 2026. It includes standard security support until 2031 and extended coverage until 2036 with Ubuntu Pro. It is distinguished by its focus on security by default, with TPM encryption, post-quantum cryptography, and system tools rewritten in Rust.

-How does full disk encryption with TPM work in Ubuntu 26.04 LTS?

The encryption links cryptographic keys to the hardware's TPM chip and the Secure Boot state. Data is only accessible on the original equipment, with the correct boot configuration. Management is done through the Security Center, allowing you to add PINs or verify Secure Boot without reinstalling the system, even after deployment.

-What is the impact of removing Xorg in Ubuntu 26.04 LTS?

With this release, Ubuntu no longer includes Xorg sessions as an alternative to Wayland. For most users, the transition is seamless. Enterprise environments with applications or hardware dependent on Xorg should assess compatibility before migrating, as there is no native way back within this LTS release.

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