It’s a stupid problem..
I want to change the owner of certain directory under /usr, so I use the command “chown”:
chown -R foo:bar /usr/some_dir, but I make a mistake :
chown -R foo:bar /usr
when I wanted to use the “sudo” command, it leads the result:
sudo: must be setuid root
So, let’s fix this stupid problem..
chown root:root /usr/bin/sudo
chmod u+s /usr/bin/sudo
it’s worth to note.