### Step 1: Check if SSH is Installed
1. Open a terminal.

2. Run: `ssh -v`
   - If it shows a version (e.g., OpenSSH), SSH is installed. If not, install it with:
     ```bash
     sudo apt update
     sudo apt install openssh-client
     ```

### Step 2: Generate an SSH Key
1. In the terminal, generate a new SSH key:
   ```bash
   ssh-keygen -t ed25519 -C "your_email@example.com"
   ```
   - Replace `"your_email@example.com"` with your email.
   - If your system doesn’t support `ed25519`, use:
     ```bash
     ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
     ```
2. Press Enter to accept the default file location (`~/.ssh/id_ed25519` or `~/.ssh/id_rsa`).
3. Optionally, enter a passphrase for extra security (or leave blank).

### Step 3: Start the SSH Agent
1. Start the SSH agent:
   ```bash
   eval "$(ssh-agent -s)"
   ```
2. Add your SSH private key to the agent:
   ```bash
   ssh-add ~/.ssh/id_ed25519
   ```
   - Use `~/.ssh/id_rsa` if you generated an RSA key instead.

### Step 4: Copy Your Public Key
1. Display your public key:
   ```bash
   cat ~/.ssh/id_ed25519.pub
   ```
   - Or `cat ~/.ssh/id_rsa.pub` for RSA.
2. Copy the output (starts with `ssh-ed25519` or `ssh-rsa`).

### Step 5: Add the SSH Key to Bitbucket
1. Log in to your Bitbucket account.
2. Go to **Personal settings** > **SSH keys**.
3. Click **Add key**.
4. Paste your public key (from Step 4) and give it a label (e.g., "Ubuntu PC").
5. Save it.

### Step 6: Test the Connection
1. In the terminal, test the connection to Bitbucket:
   ```bash
   ssh -T git@bitbucket.org
   ```
2. If successful, you’ll see a message like:  
   `"authenticated via ssh key ... You can use git to connect to Bitbucket..."`

### Step 7: Clone or Use a Repository
1. On Bitbucket, go to your repository and copy the SSH URL (e.g., `git@bitbucket.org:username/repo.git`).
2. In the terminal, clone it:
   ```bash
   git clone git@bitbucket.org:username/repo.git
   ```
   - Replace the URL with your repository’s SSH URL.

### Troubleshooting
- If you get a "Permission denied" error:
  - Ensure your public key is correctly added to Bitbucket.
  - Check file permissions: `chmod 600 ~/.ssh/id_ed25519` (or `id_rsa`).
- If asked about the host key, type `yes` to accept it.

That’s it! You should now be connected to Bitbucket via SSH on Ubuntu. Let me know if you run into any issues!