Canonical announced in February this year, the purchase of an Ubuntu Pro subscription, using the code name Jammy Jellyfish Ubuntu 22.04 LTS users to provide real-time Ubuntu kernel.

The Ubuntu real-time kernel is built on the out-of-tree PREEMPT_RT patched Linux kernel and is available exclusively for x86_64 and AArch64 hardware.

With it, Canonical hopes to further support the use of Ubuntu in telecoms / 5G equipment and other industrial systems with low-latency requirements, delivering performance, guaranteed ultra-low latency and security for critical infrastructure.

Canonical has now optimized the Ubuntu real-time kernel for Intel CPUs, providing end-to-end security and reliability for enterprises to leverage the power of Linux for a wide range of deployments across telecoms workloads, factory-floor automation systems and life-saving medical devices.

Canonical said its optimized real-time Ubuntu kernel for Intel SoCs will drive innovation, simplify operations, improve efficiency and deliver optimal productivity.

Intel TSN support ensures processing and network prioritization for time-sensitive applications and workloads, while Intel TCC support prioritizes cache, memory and network access for real-time workloads.

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The applicable Ubuntu versions are here:

• Ubuntu 23.04 (Lunar Lobster) running Linux Kernel 6.2
• Ubuntu 22.10 (Kinetic Kudu) running Linux Kernel 5.19
• Ubuntu 22.04 LTS running Linux Kernel 5.15 LTS or 5.19 HWE (Jammy Jellyfish)
• Ubuntu 20.04 LTS (Focal Fossa) running Linux Kernel 5.4 or 5.15 HWE
• Ubuntu 18.04 ESM running Linux Kernel 5.4 HWE

This update fixes the following 3 security vulnerabilities:

CVE-2023-35788：

Hangyu Hua An out-of-bounds writes vulnerability was discovered in the Flower classifier implementation in the Linux kernel that could allow an attacker to cause a denial of service (system crash) or execute arbitrary code.

CVE-2023-2430：

Ubuntu 22.10 and Ubuntu 22.04 LTS distributions running Linux Kernel 5.19

This vulnerability, discovered by Xingyuan Mo and Gengjia Chen, exists in the io_uring subsystem and allows local attackers to cause a denial of service.

Intel processor vulnerability:

A new Linux kernel security update also patches a flaw affecting Intel processors caused by the INVLPG instruction implementation not properly refreshing global TLB entries when PCID is enabled. This flaw could allow an attacker to expose sensitive information (kernel memory) or could lead to unexpected behavior.

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Users can go to the Ubuntu Core Desktop GitHub page, click the Actions tab, find the compiled version, scroll down to Artifacts, and download the ZIP file.

After the download is complete, the user can decompress it to obtain an image of less than 12GB, which can be flashed into a virtual machine or used to make a USB boot disk.

The All-Snap Desktop release provides developers with an immutable, experimental Snap-based release that complements the existing deb-based release and alleviates some of the pain points in the current release.

Canonical announced that it will launch the All-Snap Desktop version with the Ubuntu 24.04 LTS version in April next year.

Note: The latest test version of All-Snap Desktop released is not perfect enough, and there are errors such as snap portal/permission mismatch and various content missing.

The setup wizard does not add the root user, and you cannot use apt to install applications through the CLI. You can use the Snap Store in the system to install applications.

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Canonical announced that they have been working on a new way of managing PPAs (Personal Package Archives) in the upcoming Ubuntu 23.10 (Mantic Minotaur) release.

Ubuntu 23.10 development started at the end of April 2023, and some new features are starting to show up. Canonical’s Julian Andres Klode revealed one of the new features on the Ubuntu mailing list, and it has to do with how PPA archives are handled.

Until now, Ubuntu managed PPA archives via traditional .list files stored in the /etc/apt/sources.list.d/ directory and GPG keys stored in /etc/apt/trusted.gpg.d.

It doesn’t look like this approach is very reliable or safe. Therefore, starting with Ubuntu 23.10, which will be released on October 12, 2023, PPA archives will be stored as .sources files formatted using the DEB822 source format, which embeds the GPG key directly into the file’s Signed-By field.

According to Canonical, this change provides several key advantages, such as when a PPA archive is deleted, the associated GPG key is also deleted, and the GPG key is dedicated to a specific PPA archive and cannot be used for other PPAs, other GPGs Keys cannot be used to sign PPAs.Ubuntu 23.10 will also feature the upcoming GNOME 45 desktop environment, the Linux 6.5 kernel family, and some of the latest GNU / Linux technologies and open source applications.

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Thirteen years after the release of the Ubuntu Font, Canonical has announced an update to the Ubuntu Font and plans to release it with Ubuntu 23.04 “Lunar Lobster” Canonical has invited the community to test the new version of the font and welcomes Canonical has invited the community to test the new version of the font and welcomes feedback from users by way of screenshots.

Attached is the command to upgrade and try new fonts as follows. After the installation is complete, the system needs to be restarted. However, it should be noted that the official method of rolling back to the previous font has not yet been announced.

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Oliver Smith, Ubuntu project manager, made a related introduction is as follows:

"Lunar Lobster can bring good luck to IT administrators deploying and managing Ubuntu Desktop. For Ubuntu players, a stable version of Steam's snap package will also be released soon.

The classic Ubuntu Desktop installer will be replaced by Subiquity, which not only keeps the desktop and server code consistent, but also provides a more refined first-time user experience. Ubuntu 23.04 will also transition to GNOME 44, improving the experience for all users."

Canonical officially prepared 10 new wallpapers for Ubuntu 23.04:

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The Canonical team confirmed today that the Ubuntu 23.04 development board will be based on Linux 6.2. Ubuntu 23.04 is scheduled to be released on April 20, with a kernel freeze on April 6.

Linux 6.2 is the latest and most stable kernel version available, and Linux 6.3 is expected to be released in late April or early May. Linux 6.1 is an LTS long-term support release.

Dimitri John Ledkov, a long-time Ubuntu developer at Canonical, posted comments on the mailing list today, which IT House translated as follows.

"For the time being, no 6.1 kernel will be available for any Ubuntu flavors in the Lunar distribution, all flavors will be based on Linux 6.2."

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The new kernel security update is available for Ubuntu 22.10 (Kinetic Kudu), Ubuntu 22.04 LTS (Jammy Jellyfish), Ubuntu 20.04 LTS (Focal Fossa), Ubuntu 18.04 LTS (Bionic Beaver), and Ubuntu 16.04 and Ubuntu 14.04 ESM (Extended Security Maintenance) versions.

The most critical security vulnerability in these massive Ubuntu kernel updates is CVE-2022-2663, a vulnerability discovered by David Leadbeater in the Netfilter IRC protocol trace implementation.

The vulnerability could allow remote attackers to cause a denial of service or bypass firewalls. All Ubuntu versions are affected except Ubuntu 18.04 LTS, Ubuntu 16.04 ESM, and Ubuntu 14.04 ESM systems running Linux kernel 4.15.

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The only improvements that will grab attention are the upgrade to the GNOME 43 desktop environment and the inclusion of the latest Mesa in Steam Snap, but otherwise for the most part, desktop users will probably find nothing special about this release.

“All users will benefit from GNOME 43’s improvements, including GTK4 theming for improved performance and consistency. Quick Settings now provides quick access to frequently used options such as Wi-Fi, Bluetooth, dark mode and power settings,” Canonical described in the release announcement.

The company added: “The Pipewire audio platform expands support for audio devices and offers improved Bluetooth connectivity and better performance for video conferencing. Linux 5.19 improves power performance on intel devices and now includes multithreaded decompression on Ubuntu to improve multicore desktop snapshot performance.”

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Ubuntu Pro provides more comprehensive protection on top of the standard Ubuntu subscription, offering extended security coverage for critical, high and medium common vulnerabilities and exposures. It is available for every long-term Ubuntu release dating back to 16.04 LTS and covers thousands of popular open source applications and tools, including Ansible, Apache Tomcat, Apache Zookeeper, Docker, Drupal, Node.js, Puppet, Power DNS Python 2, Redis, Rust, and WordPress.

Canonical CEO Mark Shuttleworth said business users have demanded better coverage of the open source software space since the launch of the LTS version of Ubuntu, which offers five years of free security.

Canonical said the Ubuntu Pro product is aimed at business users who want to feel confident in the security of their operating system, so they can focus more on innovation and less on problem-solving.

To that end, Ubuntu Pro extends Canonical’s just-in-time security updates, which are traditionally released within 24 hours for critical CVEs, beyond the main operating system.

With Ubuntu Pro, not only does the Ubuntu OS get regular patches, but there are over 25,000 pieces of software packaged in the Ubuntu repository. Using the Canonical Livepatch tool, which is also included in the subscription, security patches can be applied as soon as they become available, without any human intervention.

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