This is not a good idea but sometime you need it for testing.
By default, the SSH server denies password-based login for root. In /etc/ssh/sshd_config, if the following line exists, possibly commented out (with a # in front):
PermitRootLogin without-password
Then change it to the following, uncommenting if needed (remove the # in front):
PermitRootLogin yes
And restart SSH:
sudo service ssh restart
Or, you can use SSH keys. If you don’t have one, create one using ssh-keygen (stick to the default for the key, and skip the password if you feel like it). Then do sudo -s (or whatever your preferred method of becoming root is), and add an SSH key to /root/.ssh/authorized_keys:
cat /home/user/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
Resources
https://askubuntu.com/questions/497895/permission-denied-for-rootlocalhost-for-ssh-connection
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