After giving the server with Ubuntu 18.04, by default MySQL will be installed version 5.7.30, if you need to upgrade the version, do the following steps:

    mysqladmin Ver 8.42 Distrib 5.7.30, for Linux on x86_64  
    Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.  
    
    Oracle is a registered trademark of Oracle Corporation and/or its  
    affiliates. Other names may be trademarks of their respective  
    owners.  
    
    Server version 5.7.30-0ubuntu0.18.04.1  
    Protocol version 10  
    Connection Localhost via UNIX socket  
    UNIX socket /var/run/mysqld/mysqld.sock  
    Uptime: 44 min 19 sec  
    
    Threads: 1 Questions: 50 Slow queries: 0 Opens: 115 Flushing tables: 1 Open tables: 24 Queries per second avg: 0.018
    
    

    Started installing MySQL 8.0.20

    Enter a command that updates the lists of packages from the repositories to get information about the latest versions of packages and their dependencies.

    sudo apt update  
    

    Enter a command that retrieves new versions of packages that exist on the server:

    sudo apt upgrade  
    

    Download the file using wget:

    wget -c https://dev.mysql.com/get/mysql-apt-config_0.8.15-1_all.deb  
    
    root@kvmde68-19464:~# wget -c https://dev.mysql.com/get/mysql-apt-config_0.8.15-1_all.deb  
    --2020-05-28 16:11:54-- https://dev.mysql.com/get/mysql-apt-config_0.8.15-1_all.deb
    Resolving dev.mysql.com (dev.mysql.com)... 137.254.60.11  
    Connecting to dev.mysql.com (dev.mysql.com)|137.254.60.11|:443... connected.  
    HTTP request sent, waiting for response... 302 Found  
    Location: https://repo.mysql.com//mysql-apt-config_0.8.15-1_all.deb [following]  
    --2020-05-28 16:11:54-- https://repo.mysql.com//mysql-apt-config_0.8.15-1_all.deb
    Resolving repo.mysql.com (repo.mysql.com)... 23.44.197.55  
    Connecting to repo.mysql.com (repo.mysql.com)|23.44.197.55|:443... connected.  
    HTTP request sent, awaiting response... 200 OK  
    Length: 35532 (35K) [application/x-debian-package]  
    Saving to: 'mysql-apt-config_0.8.15-1_all.deb'  
    
    mysql-apt-config_0.8.15-1_ 100%[=======================================>] 34.70K --.-KB/s in 0.008s  
    
    2020-05-28 16:11:54 (4.05 MB/s) - 'mysql-apt-config_0.8.15-1_all.deb' saved [35532/35532]  
    

    To check that the file downloaded, type:

    ls  
    
    root@kvmde68-19464:~# ls  
    mysql-apt-config_0.8.15-1_all.deb ubuntu-echo  
    

    Next, unpack and install it:

    sudo dpkg -i mysql-apt-config  
    

    Next, a window will appear in which you should check that it is MySQL Server & Cluster (Currently selected: mysql-8.0)

    file

    file

    Next, enter the following commands:

    sudo apt update  
    
    sudo apt upgrade  
    

    Install MySQL server:

    sudo apt install mysql-server  
    

    A window will open in which you need to enter a new root password for MySQL (Ubuntu and MySQL passwords may be different)

    file

    Next, let's click Ok

    In the window, where it says about new MySQL 8 Authentication - click Use Strong Password Encryption (Recommended)

    file

    Next, we enter the command:

    mysql_secure_installation  
    

    Enter the MySQL password.

    From there, the security questions can be answered as follows

    root@kvmde68-19464:~# mysql_secure_installation  
    
    Securing the MySQL server deployment.  
    
    
    VALIDATE PASSWORD COMPONENT can be used to test passwords  
    and improve security. It checks the strength of password  
    and allows the users to set only those passwords which are  
    secure enough. Would you like to setup VALIDATE PASSWORD component?  
    
    Press y|Y for Yes, any other key for No: N  
    Using existing password for root.  
    Change the password for root ? ((Press y|Y for Yes, any other key for No) : n  
    
     ... skipping.
    By default, a MySQL installation has anonymous user,  
    allowing anyone to log into MySQL without having to have  
    a user account created for them. This is intended only for  
    testing, and to make the installation go a bit smoother.  
    You should remove them before moving into a production  
    environment.  
    
    Remove anonymous users? (Press y|Y for Yes, any other key for No) : y  
    Success.  
    
    
    Normally, root should only be allowed to connect from  
    'localhost'. This ensures that someone cannot guess at
    the root password from the network.  
    
    Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y  
    Success.  
    
    By default, MySQL comes with a database named 'test' that  
    anyone can access. This is also intended only for testing,  
    and should be removed before moving into a production  
    environment.  
    
    
    Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y  
     - Dropping test database...
    Success.  
    
     - Removing privileges on test database...
    Success.  
    
    Reloading the privilege tables will ensure that all changes  
    made so far will take effect immediately.  
    
    Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y  
    Success.  
    
    All done!  
    

    To check that MySQL is working, we type:

    systemctl status mysql  
    
    root@kvmde68-19464:~# systemctl status mysql  
    Mysql.service - MySQL Community Server  
       Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
       Active: active (running) since Fri 2020-05-29 15:08:58 CEST; 1min 16s ago
         Docs: man:mysqld(8)
               http://dev.mysql.com/doc/refman/en/using-systemd.html
     Main PID: 22976 (mysqld)
       Status: "Server is operational"
        Tasks: 39 (limit: 1108)
       CGroup: /system.slice/mysql.service
               └─22976 /usr/sbin/mysqld
    
    May 29 15:08:56 kvmde68-19464.fornex.org systemd[1]: Starting MySQL Community Server...  
    May 29 15:08:58 kvmde68-19464.fornex.org systemd[1]: Started MySQL Community Server.  
    

    Enter a command to check that MySQL 8.0 is installed, not MySQL5.*:

    mysqladmin -u root -p version  
    
    root@kvmde68-19464:~# mysqladmin -u root -p version  
    Enter password  
    mysqladmin Ver 8.0.20 for Linux on x86_64 (MySQL Community Server - GPL)  
    Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.  
    
    Oracle is a registered trademark of Oracle Corporation and/or its  
    its affiliates. Other names may be trademarks of their respective  
    owners.  
    
    Server version 8.0.20  
    Protocol version 10  
    Connection Localhost via UNIX socket  
    UNIX socket /var/run/mysqld/mysqld.sock  
    Uptime: 1 min 47 sec  
    
    Threads: 2 Questions: 15 Slow queries: 0 Opens: 145 Flush tables: 3 Open tables: 66 Queries per second avg: 0.140
    
    

    MySQL version upgraded to version 8.0.20


    If you have already tried to install MySQL and had an error at some point, run these commands to start the process over again:

    sudo -i  
    service mysql stop  
    killall -KILL mysql mysqld_safe mysqld  
    apt-get --yes purge mysql-server mysql-client  
    apt-get --yes autoremove --purge  
    apt-get autoclean  
    deluser --remove-home mysql  
    delgroup mysql  
    rm -rf /etc/apparmor.d/abstractions/mysql /etc/apparmor.d/cache/usr.sbin.mysqld /etc/mysql /var/lib/mysql /var/log/mysql* /var/log/upstart/mysql.log* /var/run/mysqld  
    updatedb  
    exit  
    

    If you have configuration difficulties or have additional questions, you can always contact our support team via Ticket system.