Ubuntu – Cannot undo sudo chmod 655 /

chmodrootsudo

I've accidentally run 'sudo chmod 655 /', and now I cannot undo this operation again because I cannot access sudo anymore. I'd actually wanted the permission to be set to 755. Is there any way I can fix it?

Best Answer

Boot into a Ubuntu live CD or USB flash drive, and run your command from there. This should fix the permissions on your root folder. 

sudo chmod /path/to/root/ 755
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