The installer for Claude Code (Anthropic's AI coding tool) suggests running:

    sudo chown -R $USER:$(id -gn) /usr && sudo chmod -R u+w /usr

Yes, I mindlessly ran this. Yes, I deserved my temporarily bricked Ubuntu system. But to be fair, the command is presented as the *installer's "recommended" option*.

Apparently, "recommended" doesn't mean "safe" or even "tested on a real Linux machine before release."

Again, this isn't the output of the AI: it's the first thing you see when you run the installer.