I’m running in a VM another Distro and on log-in I’m asked for the user password and when needed (launching Gufw for example)i have to enter the root one.
and if i recall correctly it is the same in other Distros i tried as well.
on Manjaro the loging in password is the same as when i need to type the Sudo one,
even though i entered two different password when i installed the OS.