This should be work Ubuntu, Mint similar with Apache2
It is a nice guide, so following this
and leaving your ssl.conf like this or similar similar
<VirtualHost _default_:443>
ServerAdmin [email protected]
ServerName localhost
ServerAlias www.localhost.com
DocumentRoot /var/www
SSLEngine on
SSLCertificateFile /etc/apache2/ssl/apache.crt
SSLCertificateKeyFile /etc/apache2/ssl/apache.key
you can get it.
Hope this help for linuxer