Introduction
One of the first things that you should do when you first start up Kali Linux is to change your systems default root password. Assuming that this is a fresh image, the systems password will be set to 'kali'
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Use the command sudo passwd root
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When prompted enter your systems root command. If this is a fresh install of Kali, the default password will be set to 'kali'
 
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                            Conclusion
                          
                          The passwd command can be used to change any user account password that is set up in Kali regardless of if they're a root account or not.