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It seems in Big Sur the file you need to edit is not writable. So you need to make it writable first, edit it, and then change permissions back to read-only.

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This doesn't seem to be strictly true - the two-line solution worked exactly as expected for me on 11.2.1. I used nano instead of vi (personal preference), but it worked nonetheless.

Maybe that's the difference. I was using vi, and not nano.

Have confirmed that using 'sudo nano /etc/pam.d/sudo' works fine.

No need for the verbosity when nano works I guess. :S

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