"I will start by saying my personal opinion is that, medium to long term, the default Ubuntu that people will use will be a Core Desktop. I don't know exactly when that will happen. It certainly won't be for 26.04 or even 28.04 - this is, say, a five to ten-year thing, but I think there will come a point where, if you go to ubuntu.com/download and you click "download Ubuntu Desktop," that will be a Core image."
"If you look at where immutable Linux is right now, there's no such thing as an immutable general purpose operating system. Hence the paradox. But of what we have, Nix and Snap are kind of oddly similar, looking at how packages are built, how they end up on disk, and how they work. In fact, in Snapcraft, we use patchelf, which was originally a Nix tool, to achieve some of the things that we do."
Canonical expects the default Ubuntu Desktop to transition to an immutable Core Desktop over a five-to-ten-year timeframe, with an alternative 'Ubuntu Classic' remaining available. Significant technical, tooling, and compatibility challenges must be resolved before that shift. Immutable approaches like Nix, Snap, OSTree, and bootc each offer different trade-offs; Snap and Nix share similarities in package construction and on-disk behavior, and Snapcraft uses patchelf borrowed from Nix. Canonical is cautious about selecting a system-update mechanism and managing installer, testing, third-party app compatibility, and migration paths. Current progress is deliberate and slower than initially planned.
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