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For a somewhat stupid reason I've run sudo chmod -R 777 /usr/bin and now get the error message. I know that I've broken my suso, but is there a way to fix it know what directory is involved?

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    Can you mount the SD card in another Linux system or with a Linux Live CD? Do you have a root password on the Pi?
    – joan
    Dec 2, 2015 at 22:20
  • I have the root pw and I have access to the SD card from LinuxLind. Dec 3, 2015 at 11:24
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    Have you tried logging on as root and changing the permissions back to 644 for /usr/bin? For sudo additionally do chmod +s /usr/bin/sudo
    – joan
    Dec 3, 2015 at 11:58
  • Joan, how do I incorporate my original root password in these commands? Dec 3, 2015 at 18:44
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    I am only talking about the Pi. It seems likely that the quickest solution will be to start again from scratch and reimage your Pi SD card.
    – joan
    Dec 3, 2015 at 20:04

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