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CatalinaのSIPでRead-only file systemエラーが/usr/領域操作で出てきたとき

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前提

こちらでSIPのガードを外していること
初心者向け MacでOperation not permittedの解決方法

起こった問題

開発用にlibftd3xx.dylibをコピーしようとしたときのこと。

$ sudo cp libftd3xx.dylib /usr/lib/
Password:
cp: /usr/lib/libftd3xx.dylib: Read-only file system

Read-onlyということで結局コピーできない。

どうやって解決したか

Catalinaの問題らしい?
こちらのStackOverflowで回答がありました:Read-only file system" with SIP disabled in macOS Catalina

$ sudo mount -uw / 
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