How to set up SSL certificate (not self-signed) on virtual host on Ubuntu?

[stiuvert0007]

I tried like this with no effect..Why is only one certificate file in your config? I have two- main.crt and intermediate.crt. Also I tried to include in several apache2 config files your config file with no effect... Is somebody here who could make step by step guide to how to do this please?

Sorry for leave this thread, I was very busy with school. Have you managed to work your server with SSL?

I´m no expert but I have 4 sites working with http and https thanks to the guide of Me.B  
If you have used the solution in the wiki, try to revert all that. Remove all overrides and SSL configs that you changed and leave it like Sentora´s default vhost config.
My SSL certificate is a PositiveSSL from Comodo. They give you 4 files AddTrustExternalCARoot.crt, COMODORSAAddTrustCA.crt, COMODORSADomainValidationSecureServerCA.crt and the yourdomain_com.crt certificate file. You have to make a bundle with this files but RapidSSL give you different files.
I don´t know what files they give you but I can tell you that I have 2 sites working with SSL with Cloudflare.
They give you an option to secure your site with a Self-signed certificate to encrypt your server to Cloudflare server, then they encrypt the communication from their servers to the end user with a free certificate. Check out this: https://zoquiaqui.com (I have another site working like this)
As you didn´t buy any certificate this will probably be the best option for you. I can help you step-by-step to configure this. Send me a MP   then we´ll post the how to, for helping others.