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Ubuntu just broke Ubuntu — and the culprit was its brand-new Rust rewrite of the classic `cp` command. The world’s most popular Linux distro has been replacing the trusted 30-year-old GNU Coreutils (written in C) with the memory-safe Rust uutils project, and this time the new Rust `cp` backfired so badly it stopped Ubuntu from building Ubuntu itself. In this video, I break down exactly what went wrong with the Rust Coreutils migration, why the `cp -afL` flag combination broke Ubuntu’s `livecd-rootfs` ISO build pipeline, and what this whole mess means for the future of Linux.
We dig into the critical `cp` regression bug, how GNU’s C implementation and Rust’s `clap` argument parser handle command-line flags so differently, why memory safety doesn’t guarantee behavioral compatibility, how Canonical quickly reverted to the GNU binary with a dual-binary fix, and the bigger GPL vs MIT licensing debate sitting behind the entire GNU Coreutils to Rust uutils transition across Ubuntu 25.10 and Ubuntu 26.04 LTS.
In this video:
– What actually happened when Ubuntu switched `cp` to the Rust version
– Why one tiny flag halted every daily Ubuntu ISO build
– Why the `cp` command is way harder to rewrite than it looks
– Why Linux users are nervous about rewriting `cp`, `mv`, and `rm` in Rust
– A fair look at Rust, uutils, and Canonical’s bold experiment
– The GPL vs MIT licensing angle nobody’s talking about
– Should regular Ubuntu desktop users actually worry?
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