Just switch as root, the environment is still a normal user shell
his, its - its root
Follow the prompts to enter the root password, you can log in to the root authority.
User and the environment have been switched to root shell
sudo -i sudo su, sudo su root
Follow the prompts to enter the root password, you can log in to the root authority
(The three commands, generally do not need to enter the appropriate root password) .
root switch to common user
Users want to switch back to user root from a user simply execute the command: su username
Disable and enable root login
Sudo passwd -l root to perform (just disable the root, but the root password is still preserved), and then execute su root discovery authentication fails (but still have access to sudo su command under root mode).
To start the root login again, you can execute sudo passwd -u root.