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Quote Originally Posted by sisco311 View Post
Try to boot in recovery mode and restore the permissions:
Code:
chmod 0755 /
chmod 0755 /*
chmod 1777 /tmp
chmod 0750 /root
chmod 0700 /lost+found
If you can boot in recovery mode, then boot a liveCD, mount the root partition and restore the permissions.

sisco311,


It seems that ubuntu works exactly as before after I changed the root permission according to your advice in the recovery mode (is there anythings else I need to do now to be sure ubuntu is fully restored?).
So thank you, and thanks all the other for trying to help (and I also want to thank god I was not listening to their advice )


What other dangers should I be aware of in this respect, and does ubuntu have any option of restoring itself (In my case, I must sudo many times in different ways, and it is impossible not to make simple misprints sometimes)