As of May 1st, 2025, Canonical has officially opened the development of Ubuntu 25.10 (codename Questing Quokka), and now they have published the first daily build ISO images for early adopters, application developers, and general public testing.

As expected, the first Ubuntu 25.10 daily builds are based on the previous Ubuntu release, Ubuntu 25.04 (Plucky Puffin), which arrived last month on April 17th, which means that they include the same core components and software versions as the Plucky Puffin release, such as Linux kernel 6.14 and GNOME 48 desktop.

During the six-month-long development cycle, the Ubuntu 25.10 daily build ISOs will be updated with many highly anticipated GNU/Linux technologies, such as the upcoming Mesa 25.1 graphics stack and Linux 6.17 kernel series, as well as the upcoming GNOME 49 desktop environment.

The toolchain will be updated to recent technologies like GCC 15, GNU Binutils 2.45, Python 3.13, LLVM 20, Boost 1.88, and others. Also, it looks like Ubuntu 25.10 will be the first major Linux distribution to adopt sudo-rs as the default implementation of sudo.

You can download the first Ubuntu 25.10 daily build ISO images from the official website. Daily builds of Kubuntu, Xubuntu, Lubuntu, and the rest of the official Ubuntu flavors are also available for download here with the same desktop environments used by default in Ubuntu 25.04.

However, you should keep in mind that these are pre-release versions that may contain bugs and other issues preventing you from having a stable Ubuntu experience. Therefore, DO NOT install them on a production machine!

The final release of Ubuntu 25.10 (Questing Quokka) is expected on October 9th, 2025. Until then, the beta version of Ubuntu 25.10 is expected on September 18th, and the Release Candidate (RC) version should arrive on October 2nd, 2025.

Two “Ubuntu Testing Week” events are also scheduled for June 26th and August 21st, 2025, respectively. During these “Ubuntu Testing Week” events, Canonical expects the community to test drive the upcoming Ubuntu release and report bugs.

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