Normally, I can get this to work, but I think there's a new authentication layer getting in my way. If I change in /etc/ssh/sshd_config "PermitRootLogon yes" I can get in via password. If I change ...

The following methods can be used for resetting the root password if the root password is unknown. If you use GRUB for booting, select the system to be booted, and add 1 to the end of the kernel boot ...

A now-fixed Sudo vulnerability allowed any local user to gain root privileges on Unix-like operating systems without requiring authentication.