Set the root password after Ubuntu is installed on a virtual machine

Problem description: Enter the user name in Ubuntu installed on the Virtual Machine. Generally, you will enter your own network name or nickname, And the password is also set.

However, after the installation is successful, run the command # su root, enter the password you just set, and find that the password is incorrect. at the beginning and end, I set the password once. How can this problem be wrong,

For the sake of security, during the installation process, the system shields users from setting root users. As a result, many users do not know what the root password is.

Then, the solution is as follows.

1. Unlock the root account and set the password for the root user.

Open the terminal and enter sudo passwd.

Password: <--- enter your current user password

Enter new Unix Password: <--- New Root User Password

Retype new Unix Password: <--- repeat the New Root User Password

Passwd: the password is successfully updated.

2. Change logon to allow root logon.
Open System> System Management> logon window)

Click the "Security" option page and select "Allow Local Administrator Logon ".

3. log out of the current user and log in as root.