How to set sudo password (root and su) different from user password?

Question

Access rights

OS Ubuntu 14.04.
You need to set two passwords (different from each other): one for the user (for logging in), the other for sudo, su and root.

Answer 1

Get another user, there will be root, superuser and your user.

Answer 2

sudo passwd root

Answer 3

for sudo - no way. Password for sudo == user password.
For su - passwd root

Answer 4

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