Hello everyone, I am a newbie. Can you ask me a weak question?

Hello everyone, I am a newbie. Can you ask me a weak question? -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. These days, I have always wanted to learn linux, but during the course of study, I encountered too many problems. I did not know much about the good tutorials. I also found that there are still good problems by using the tutorial commands, I think it should be a problem with the system version and software version, which may lead to some errors. I wanted to learn the mail server first, and I first learned sendmail and looked at it. Then someone said that this configuration was too annoying and changed to postfix, in fact, it is not easier than sendmail. After a few days, I decided not to start with such a large email system. It was also quite difficult to use squid to discover the problem, first, install squid with the rpm package. It seems that you have encountered a dependency problem, but you haven't done it yet. Finally, you can hear other people say that these services can be used for half a day, but ubuntu is used, after downloading a 9.10 installation, select the server. However, after installation, it is not found in the window for configuring various services on the GUI. Here I believe some experts want to talk about it. I am not worried about it. I should start from the beginning and take a long time. But what I want to say is to first set up a graphical interface for dismounting, and then study the configuration file, finally, use the character interface to install and learn.

After talking about this, I just want to know whether ubuntu has the function of installing and configuring the service on a GUI, or whether it must be set up using commands.