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  • MacFormat

    macOS

    May 04, 2021 4 minutes

    Quick-fire questions

    How can I fix the sudo bug in High Sierra?

    Apple has released security updates for Mojave, Catalina and Big Sur which fix this bug. Macs running an older version of macOS will still be vulnerable and there’s no official update on offer. Installer packages for older versions of macOS are available from Todd Miller’s site at bit.ly/mac365sudo.

    Why do some image thumbnails look rubbish?

    QuickLook builds an initial thumbnail very quickly, but that may contain Moiré noise which can deface images. A few seconds later, that first attempt should be replaced with a higher-quality version, so the

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