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 You can set up a free SSL certificate from Let’s Encrypt to use with Apache by following these steps:

1. Install Certbot:

   
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   sudo apt-get update
   sudo apt-get install certbot
   
   

2. Obtain a certificate:

   
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   sudo certbot certonly --webroot --webroot-path /var/www/html -d example.com
   
   

   Replace example.com with your own domain name.

3. Update Apache virtual host:

   
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   sudo nano /etc/apache2/sites-available/example.com.conf
   
   

   Add the following lines inside the VirtualHost block:

   
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   SSLEngine on
   SSLCertificateFile /etc/letsencrypt/live/example.com/fullchain.pem
   SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem
   SSLCertificateChainFile /etc/letsencrypt/live/example.com/chain.pem
   
   

   Save and exit the file.

4. Test Apache configuration:

   
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   sudo apachectl configtest
   
   

   If the output is “Syntax OK,” restart Apache:

   
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   sudo systemctl restart apache2
   
   

Your Apache server should now be configured to use the Let’s Encrypt SSL certificate. You can test it by visiting https://example.com in a web browser.