Activating Root Login on Ubuntu 20.10
Edit the SSHD Configuration
Open the /etc/ssh/sshd_config
file with administrative privileges and change the following line:
#PermitRootLogin prohibit-password
PermitRootLogin yes
The quick way to do this job could be just to simply use the sed command as shown below:
$ sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
Restart SSH Service
sudo systemctl restart ssh
Activate the Root User
By default the root's password is not set on Ubuntu 20.04 and the error message Permission denied, please try again will appear when attempting to SSH login as a root user. From this reason we need to set root's password. When prompted enter your current user password followed by new root password:
sudo passwd
[sudo] password for mylinuxuser:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully