Failed to install mysql in Ubuntu

Due to various reasons, I recently think that Ubuntu and Windows 7 systems are very uncomfortable, so I am bored with formatting the hard disk and re-installing a new Ubuntu single system. It seems that I haven't been in touch with a single-system computer for a long time, and the Ubuntu installed on the hard disk is much smoother. But I regret a job! The configuration of jdk, mysql, and tomcat is about to be restarted.
After www.2cto.com deletes unnecessary software, it begins to configure its own new system. First, install mysql first. Run sudo apt-get install mysql-server and ignore it. When I came back, I encountered the following error:
Www.2cto.com is very tragic, and the installation was not successful. As a result, various solutions such as Google, Baidu, and Bing are unsuccessful. So I planned to reinstall mysql and execute some commands as shown in: I finally understood that I didn't install mysql at all. Why is there such a prompt !? I really don't understand. However, after the reinstallation, it can be used properly.
The experience obtained by www.2cto.com is that most of the reasons why I don't like linux are that the operations are too complicated, but linux is getting better and better. However, compared with windows, the GUI is really a gap between heaven and earth!