How to solve error 'root /usr/bin/sudo must be owned by uid 0' in ubuntu

In general life we often face the problem when system gives error root /usr/bin/sudo must be owned by uid 0, while trying to run command as sudo in ubuntu. It’s a very common problem we can face if by mistake or by any means, we have modified the permission of sudo. Here are the steps to solve this issue:

Follow these steps:

• Restart and boot system in recovery mode. If you are using dell then you can try by pressing CTRL while booting.
• Run the following commands
• mount -o remount,rw /
• mount --all
• chown root:root /usr/bin/sudo
• chmod 4755 /usr/bin/sudo
• init 6 or run restart

After restarting system, You can try commands running with sudo and its works !!