How can I solve this error : sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

Thank you lampreyOne,

I do not know if your solution works, but I found an article here:

http://bitmapcake.blogspot.sk/2014/08/linux-fixing-error-sudo-usr-bin-sudo-must-be-owned-by-uid.html

and it worked for me. Thank you.

First restart your pc, and press the SHIFT key while Ubuntu is booting.

This will bring you up the boot menu.

Select Advanced Options.

Select your OS version in (recovery mode), and press Enter Key.

Ex : Ubuntu 14.04 (recovery mode)

It will bring you up another screen. Now select “Drop to root shell prompt” and press Enter.

It will load a command line at the bottom of the screen.

Now run each of the following commands.

mount -o remount,rw /

mount --all

chown root:root /usr/bin/sudo

chmod 4755 /usr/bin/sudo

restart

Now your pc will restart. Once you log in, you will find that you can use the sudo command again .

https://www.youtube.com/channel/UCo-36Ev7P3LuuB856IDRL7Q

You can chmod u+s /usr/bin/sudo Though you’ll need to actually log as root, if you can’t sudo right now.

I don’t know of any way of automatically restoring all the permissions on the rest of the files.