sudo:must be setuid root

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As a noob, I do noobish things. Here's the latest.

Something went haywire with Firefox (probably because I deleted something inadvertently when I was getting rid of old files), and I restored /usr from my backup drive using rsync in an attempt to fix Firefox. Apparently, rsync changed the ownership of /usr to the userid under which it was executed. When I tried to run sudo, I got this:

sudo:must be setuid root

Browsing the net for advice, I found scattered, incomplete help for questions that were close to, but not quite the same as mine.

Basically, the solution is to change ownership back to root. Culling bits and pieces from different sources, here's what I ended up doing:

1. Rebooted and hit ESC at the prompt to get the grub menu.
2. Chose 'root console' from the grub menu.
3. Ran the following commands:

chown root:root /usr/bin/sudo
chmod 4755 /usr/bin/sudo
chmod 0440 /etc/sudoers
reboot

When the system came back up, everything was normal again.

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