Up until Windows 10 arrived Ive never had any trouble installing development tools using the LAMPP. I'll demonstrate on Ubuntu Server 18.10, but will also give indications on how the process is done on Red Hat and Fedora-type servers. I want to use TiKi to use as a collaboration website. Let me show you how you can change the port for Apache.
With Apache, that's not only possible, it's easy. For instance, if you have a site for customers on port 80 and you want to serve up a site for clients on port 8081. This is also a good trick to have up your sleeve when you have a single Apache server hosting sites that might require using different ports for different services. The one caveat to this is that when you change the default port, all browsers will have to point to that specific port, otherwise any virtual host using the non-default port will not render. What if you didn't have to leave the Apache web server vulnerable to port 80 attacks? Considering you can easily change the configuration such that your Apache virtual hosts will listen to non-standard ports, it makes perfect sense for anyone having trouble with port 80 attacks. But the thing is, hackers know that port 80 is the default and target it with ease.
Per phpvillian's answer, you can also run the following to help determine the culprit (make sure you open the command line with elevated privileges, e.g.