Hi
I am not sure by "user" you mean "you" or another user sharing your PC
until you get a better answer....
sudo su
does not need a password set and will then allow you to run multiple root commands.
If you need a root password set.....such as setting up a printer then try, for this session,
sudo passwd
input your password, press enter and re-input.
this password is not saved unless you choose to backup your changes.
2) cups does not care what password you used when you first set a password, 2 weeks later,
if you have to make a change to printer that needs root password, create a new password.
Hope that helps