Can't SSH in as root
The default setting in Debian (and hence Ubuntu) for OpenSSH Server is to deny password-based login for root and allow only key-based login. Change this line in /etc/ssh/sshd_config
:
PermitRootLogin without-password
to
PermitRootLogin yes
And restart the SSH server:
sudo service ssh restart
To me, works changing (Ubuntu 18.04):
sudo nano /etc/ssh/sshd_config
PermitRootLogin prohibit-password
toPermitRootLogin yes
PasswordAuthentication no
toPasswordAuthentication yes
then, restart ssh service:
sudo service ssh restart
Thanks!