How to switch between root and ordinary users in ubuntu

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After logging in to ubuntu, the default is ordinary user permissions. So how to switch between ordinary user permissions and root permissions? Here is a summary of how to switch between them.

Switch from ordinary user to root user

After logging in to ubuntu, press the key combination CTRL+ALT+T to enter the terminal interface, the general terminal interface The default is the ordinary user permission mode. How to enter the root user from an ordinary user, there are the following methods:

1. Press su, and then enter the corresponding root password as prompted to log in with root permissions.

2. Press sudo su, and then enter the corresponding root password as prompted to log in with root authority (under this command, you generally do not need to enter the corresponding root password).

3. Press su root, and then enter the corresponding root password as prompted to log in with root permissions.

There are three ways to switch the root user to a normal user:

1. If you want to switch back to the user user from the root user, just execute the command: su user (user is your user name during installation),

2. Enter exit directly,

3. Ctrl+D key combination to exit

How to set a password for the root user: Just execute the command: sudo passwd root and follow the prompts step by step.

Disable and enable root login

Execute sudo passwd -l root (just disable root, but the root password is still saved), then execute su root and find that the authentication failed, (but sudo su command can still enter root mode).

To start root login again, execute sudo passwd -u root.

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