The first requirement is to make sure you have access to an appropriate Linux installation, Here, it is assumed that you are using Ubuntu 18.04. If you use something else, you may need to adapt the instructions provided.
You also need to make sure that you have superuser (root) privilege so that you can configure the environment as required. To check that you have the appropriate privilege, enter the following command at the command line:
You may be prompted to enter your password, but then you should see the following output:
If you get some other output, you do not have the appropriate privilege and you should fix this issue before going any further. This could mean, for example, contacting the person who set up the server for you.