Create user with sudo privileges 

To create a new user with sudo privileges and add an SSH certificate, follow these steps:

1. Log in to your Linux machine as the root user.

2. Run the following command to create a new user called "myuser" with sudo privileges:

useradd -m -G sudo myuser

3. Set a password for the new user by running the following command:

passwd myuser

4. Generate an SSH key pair for the new user by running the following command:

ssh-keygen -t rsa -b 4096 -C "[email protected]"

5. Press enter to accept the default file location and name for the SSH key pair.

6. Enter and confirm a passphrase for the SSH key pair.

7. Add the newly created SSH key to the authorized keys file for the new user by running the following command:

cat ~/.ssh/id_rsa.pub >> /home/myuser/.ssh/authorized_keys

8. Set the correct permissions for the authorized keys file by running the following command:

chmod 600 /home/myuser/.ssh/authorized_keys

With these steps, you should have a new user with sudo privileges and an SSH certificate set up on your Linux machine.