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Can't remove file from S/L/E


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Dell 5580, under Catalina, i try to remane file in S/L/E to resolve audo problem when i plug my earphone and the file still in RO with sudo

     sudo mv AppleGFXHDA.kext AppleGFXHDA.kext.bck

     mv: rename AppleGFXHDA.kext to AppleGFXHDA.kext.bck: Read-only file system

Any suggestion ?

Txk a lot


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