Ubuntu Archives

Tech Optimizer

May 20, 2026

Critical PostgreSQL Flaws Enable Code Execution and SQL Injection

On May 14, 2026, PostgreSQL released critical security updates for versions 18.4, 17.10, 16.14, 15.18, and 14.23, addressing 11 Common Vulnerabilities and Exposures (CVEs) related to stack buffer overflows, SQL injection, memory disclosure, and denial-of-service vulnerabilities. The most critical vulnerability, CVE-2026-6637, has a CVSS score of 8.8 and allows remote, unprivileged database users to execute arbitrary code. Other notable vulnerabilities include CVE-2026-6473, which affects memory allocation leading to potential memory corruption, and CVE-2026-6475, which allows overwriting sensitive OS-level files. Additional vulnerabilities include SQL injection flaws and authentication issues, with various CVSS scores ranging from 3.7 to 7.5. The updates can be implemented without a database dump, and PostgreSQL 14 will reach its end-of-life on November 12, 2026.

AppWizard

May 6, 2026

Linux running on a PS5 turns it into a Steam Machine that plays PC games

Researcher Andy Nguyen has developed a method to convert a PlayStation 5 into a Linux-based device, similar to a Steam Machine. This modification is only possible on launch-era PS5 consoles running system software version 4.5 or earlier, which dates back to December 2021. The process involves using a specific exploit to boot the operating system from a USB stick or the console's M.2 SSD expansion slot. The setup allows access to Ubuntu 26.04 LTS, utilizing 15GB of memory, all eight cores of the Zen 2 processor at 3.5 GHz, and all 36 compute units of the RDNA 2 GPU at 2.23 GHz. Users can control cooling by increasing fan speeds for overclocking. The output resolution is limited to 1080p, with performance tests showing comparable frame rates to the native PS5 environment for games like Black Myth Wukong, Crimson Desert, and Pragmata. However, issues such as stuttering and artifacting may occur due to the Proton compatibility layer and memory management challenges. This experiment suggests potential for emulation and playing PlayStation 3 games at enhanced settings.

AppWizard

May 5, 2026

PlayStation 5 Linux Tested: Steam PC vs Native PS5 Games

Linux has been successfully implemented on the PlayStation 5, allowing users to run an open operating system on the console. This implementation, led by security researcher Andy Nguyen (TheFlow), utilizes an exploit for PS5 consoles with system software versions up to 4.5. Users can boot Linux from a USB or SSD, with Ubuntu 26.04 LTS providing around 15GB of usable memory. The PS5's hardware, including its Zen 2 processor and GPU, is fully accessible, with CPU speeds reaching up to 3.5GHz and GPU speeds up to 2.23GHz when boost mode is activated. However, running Linux on the PS5 presents challenges, such as sourcing a unit with the required firmware and limitations in resolution, as users cannot exceed 1080p. Performance tests showed that Linux can match the PS5's performance in some titles, but issues with memory management were noted, leading to stuttering and crashes in certain games. For example, reducing texture quality improved performance in games like Pragmata, while rendering issues were observed in Crimson Desert. The implementation allows for a unique gaming experience, but it also highlights the complexities and limitations of running Linux on a gaming console.

Winsage

May 4, 2026

Windows 11 Gamer Base Grows as Linux Slips in Steam Survey Data

As of April, Windows 11 represents 67.74% of the Steam gaming community, reflecting a 0.89% increase from the previous month. Linux-based systems have decreased to 4.52%, down 0.81% since March. The overall share of Windows-based gaming PCs has climbed by 1.14%, totaling 93.47% in the gaming sector. Windows 11 is favored by gamers for its game compatibility and user-friendly interface, while efforts to enhance Linux support for major AAA titles face challenges due to the complexities of the Linux ecosystem. Companies like Valve are working on tools to run Windows-exclusive games on other platforms.

Winsage

April 18, 2026

France has ditched Windows 11 for Linux on 2.5 million government PCs — here’s why Microsoft should worry that millions more could follow by the end of 2026

Dissatisfaction with Windows 11 is widespread, prompting the French government to transition from Windows to Linux for its computer systems, aiming for 'digital sovereignty.' French officials, including Minister David Amiel, emphasize the need to reduce reliance on American tools and regain control over digital infrastructure. The transition is mandated to be completed by fall 2026, with GendBuntu, a variant of Ubuntu, likely being adopted. Over 100,000 PCs currently run GendBuntu, and an additional 2.5 million government workstations will migrate from Windows. Other regions, such as Schleswig-Holstein in Germany and Denmark, are also moving away from Windows. Users have reported issues with Windows 11, leading to a backlash and prompting Microsoft to promise fixes. However, the effectiveness of these improvements remains uncertain, and if unresolved, users may increasingly consider alternatives like Linux or macOS. Microsoft has revamped its Windows Insider program to gather user feedback but lacks clarity on internal quality assurance improvements. The company's ability to regain user trust hinges on addressing ongoing concerns effectively.

Winsage

April 8, 2026

“Wait, Windows uses less?”: I break down the surprising requirement that flips the Linux vs. Windows script

Ubuntu 26.04 LTS, developed by Canonical, will be released on April 23, 2026, with updated desktop requirements of a 2GHz dual-core processor, 6GB of RAM, and 25GB of storage. Unlike Windows 11, which enforces strict minimum requirements, Ubuntu allows installation on lower-spec machines, though performance may be compromised. The new requirements reflect a shift away from supporting older hardware, as the operating system incorporates a modern desktop stack with updated GNOME components and Wayland support. Ubuntu's installer evaluates hardware capabilities but does not block installation on unsupported devices, contrasting with Windows 11's rigid installation process that requires specific hardware features like TPM 2.0 and Secure Boot.

Tech Optimizer

April 5, 2026

Linux 7.0 Cuts PostgreSQL Performance in Half

An AWS engineer reported a significant drop in PostgreSQL throughput on Linux 7.0, with performance reduced to approximately half of its previous capability. Benchmark tests showed that the removal of the PREEMPT_NONE scheduling option was the main cause of this regression. On a 96-vCPU Graviton4 instance, throughput measured at just 0.51x compared to earlier kernel versions. Salvatore Dipietro from Amazon/AWS conducted benchmarking analysis of PostgreSQL 17, revealing that Linux 7.0 delivered only 0.51x the throughput of its predecessors. The root cause was traced to kernel commit 7dadeaa6e851, which eliminated PREEMPT_NONE as the default option, leading to increased contention due to the new PREEMPT_LAZY model. Profiling data indicated that 55% of CPU time is consumed by spinning in PostgreSQL’s spinlock, causing significant performance degradation. When a revert patch was applied, throughput rebounded to 1.94x the baseline. The decision to restrict preemption modes in Linux 7.0 aimed to address issues within the kernel's scheduling model. Dipietro proposed a patch to restore PREEMPT_NONE, but kernel developers suggested PostgreSQL adopt the rseq time slice extension instead. Database operators running PostgreSQL on Linux face potential performance reductions with the upgrade to Linux 7.0.

Tech Optimizer

April 4, 2026

AWS Engineer Reports PostgreSQL Performance Halved By Linux 7.0, But A Fix May Not Be Easy

An engineer from Amazon/AWS reported a significant performance regression in PostgreSQL when running on the nearly finalized Linux 7.0 kernel, with throughput dropping to about half of previous kernel versions. The regression, observed on a Graviton4 server, is attributed to increased time spent in a user-space spinlock due to changes in preemption modes in Linux 7.0. A patch to revert to PREEMPT_NONE as the default preemption model has been submitted but may not be adopted. Peter Zijlstra suggested that PostgreSQL should adapt to utilize the Restartable Sequences (RSEQ) time slice extension to mitigate the performance drop. If this adaptation is accepted, the responsibility for the performance decline may shift to PostgreSQL, potentially affecting users until the database is updated. The stable release of Linux 7.0 is expected in about two weeks, coinciding with the launch of Ubuntu 26.04 LTS.

Winsage

April 3, 2026

Ubuntu 26.04 now needs more RAM than Windows 11, which says more about Microsoft than Canonical

Ubuntu 26.04 LTS, set to be released on April 23, has updated system requirements that include a 2 GHz dual-core processor, a minimum of 6GB of RAM, and 25GB of free disk space. This version will be supported until April 2031. In comparison, Windows 11 can run on a 1 GHz dual-core processor with just 4GB of RAM, but this may lead to poor performance. Ubuntu's specifications aim to provide a better user experience.

Winsage

April 3, 2026

I saved a doomed Windows laptop by embracing Linux

The author switched from a MacBook Air to a nine-year-old ThinkPad X1 Carbon Gen 5, which does not meet the requirements for Windows 11 due to its 7th-gen Intel processor. Microsoft ended support for Windows 10 in October, leaving many devices like the ThinkPad considered "obsolete." The author installed Linux Mint on the ThinkPad, which is compatible with older hardware and provides a user-friendly experience. The ThinkPad has 16GB of RAM, 512GB of storage, and was purchased for 0. Despite some challenges, such as reduced battery life and minor driver issues, the device remains functional for everyday tasks. Linux Mint is free and open source, requiring no mandatory agreements for installation.