In the default configuration root has no password and PermitEmptyPasswords is set to no in /etc/ssh/sshd_config, so even if PermitRootLogin is set to yes, it is not possible to login as root by default.
-- sshd and root access policy inconsistency https://launchpad.net/bugs/91114 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
