mydomain.com shows Ubuntu page, but if I put mydomain.com:8080 it shows me my page. How can I do so when I enter mydomain.com, enter my page and do not have to put the 8080.
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You likely have Apache installed on port 80, and something else on port 8080. You need to create an Apache virtual host for your domain which performs a reverse proxy to port 8080 so that it serves the contents over port 80. Here are two guides that can serve as examples:
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