Comparing to Windows, Ubuntu has more restriction in the file system and other system settings. To change some root level configurations you need to enter root password. By default the Root account password is locked in Ubuntu. In this case you can either change the default root password or use sudo command to login as root user which is stored by default for 15 minutes. After that time, you will need to enter your password again. In this post I included the simple steps to change the default root su password in Ubuntu.
1. Open Terminal (Ctrl + Alt + T)
2. Type sudo passwd and press Enter ( enter sudo password )
3. Then you will be asked to Enter new UNIX password twice.
That's it .. Your Password Successfully changed.
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