Password Authentication

The error "No identities found" when running ssh-copy-id indicates that the SSH agent does not have any SSH keys loaded, or the keys are not stored in the default location (~/.ssh/id_rsa.pub).

Here's a step-by-step guide to resolve this:

Check for Existing SSH Keys: Ensure you have an existing SSH key pair. Check the ~/.ssh directory:
```
ls ~/.ssh
```

Look for files named id_rsa (private key) and id_rsa.pub (public key). If they exist, proceed to step 3. If not, go to step 2.

Generate a New SSH Key Pair: If you don't have an SSH key pair, generate one using:
```
ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
```
Follow the prompts to save the key to the default location (~/.ssh/id_rsa) and optionally add a passphrase.
Load the SSH Key into the SSH Agent: Ensure the SSH key is loaded into the SSH agent. Start the SSH agent if it is not already running:
```
eval "$(ssh-agent -s)"
```

Add your SSH key to the agent:

ssh-add ~/.ssh/id_rsa

Copy the SSH Key to the Remote Server: Now you can copy your SSH key to the remote server:
```
ssh-copy-id ubuntu@54.237.154.120
```

If you encounter any issues, make sure the SSH agent is running and has your key loaded by checking the output of:

ssh-add -l

This command lists the keys currently managed by the SSH agent.