After ubuntu is installed, the initial root password (default password) is unknown and needs to be set.
1、 First log in to the system with the user who installed it
2、 Input: sudo passwd and press enter
3、 Enter the new password, repeat the password, and finally prompt passwd: password updated sucessfully
At this time, the root password setting has been completed
4、 Input: su root
Try switching user to root...
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