Ubuntu 25.10 replaces initramfs-tools with Dracut for generating the initramfs boot image. Dracut is a modular, hardware-detection-based system that supports modern technologies like TPM2 and FIDO2, offering slightly faster boot times and better maintainability. The change only affects fresh installs, not upgrades, and remains invisible to most users. While technically significant for the distribution's infrastructure, it requires no action from typical users unless they've customized initramfs hooks.
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