How to access the root account on a Linux server remotely, bypassing physical connection via USB device?

To remotely access the root account on a Linux server without physical connection via a USB device, the SSH (Secure Shell) protocol is usually used.

To gain access:

1. Ensure that the SSH server (usually sshd) is running on the server.
2. Use an SSH client with root privileges or with an account that has sudo rights.
3. Connect via the server's IP address or domain name:

ssh root@server_ip

If direct root login is prohibited (which is often recommended), you can connect as a regular user and then execute sudo -i or sudo su - to obtain root access.

For security, it is recommended to use SSH keys instead of passwords and to restrict access by IP or VPN.

If SSH is not configured or unavailable, then without physical access, obtaining root access is not possible, as it violates system security.