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Apr 21, 2016 - You can learn how to do this by completing steps 1-4 in the initial server setup for Ubuntu 16.04. Step 1: Install Apache and Allow in Firewall. The Apache web server is among the most popular web servers in the world. Step 2: Install MySQL. Step 3: Install PHP. Step 4: Test PHP Processing on your Web Server.

apt - Installing PHP 5.3 in Ubuntu 14.04 - Ask Ubuntu

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https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu-16-04

 

 

information.

Again, we can use apt to acquire and install our software. This time, we'll also install some other "helper" packages that will assist us in getting our components to communicate with each other:
    

  • sudo apt-get install mysql-server

    •
Note: In this case, you do not have to run sudo apt-get update prior to the command. This is because we recently ran it in the commands above to install Apache. The package index on our computer should already be up-to-date.
Again, you will be shown a list of the packages that will be installed, along with the amount of disk space they'll take up. Enter Y to continue.
During the installation, your server will ask you to select and confirm a password for the MySQL "root" user. This is an administrative account in MySQL that has increased privileges. Think of it as being similar to the root account for the server itself (the one you are configuring now is a MySQL-specific account, however). Make sure this is a strong, unique password, and do not leave it blank.
When the installation is complete, we want to run a simple security script that will remove some dangerous defaults and lock down access to our database system a little bit. Start the interactive script by running:
    

  • mysql_secure_installation

    •
You will be asked to enter the password you set for the MySQL root account. Next, you will be ask
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First of all, do backup of your needed databases with mysqldump (Note: if you want to restore later, just backup your relevant databases, and not the WHOLE, because the whole database might actually be the reason you need to purge and reinstall). You need to remove the /var/lib/mysql folder.Jun 1, 2012

ubuntu - Removing MySQL 5.5 Completely - Stack Overflow

 

 

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https://stackoverflow.com/questions/10853004/removing-mysql-5-5-completely

 up vote 276 down vote

First of all, do backup of your needed databases with mysqldump (Note: if you want to restore later, just backup your relevant databases, and not the WHOLE, because the whole database might actually be the reason you need to purge and reinstall).
In total do this:
sudo service mysql stop  #or mysqld
sudo killall -9 mysql
sudo killall -9 mysqld
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoclean
sudo deluser mysql
sudo rm -rf /var/lib/mysql
sudo apt-get purge mysql-server-core-5.5
sudo apt-get purge mysql-client-core-5.5
sudo rm -rf /var/log/mysql
sudo rm -rf /etc/mysql

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https://askubuntu.com/questions/643251/having-trouble-installing-and-removing-mysql-in-ubuntu

 up vote 30 down vote
Try doing a purge, then re-install.
sudo apt-get remove --purge mysql-\*
sudo apt-get install mysql-server mysql-client
 
 

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 https://askubuntu.com/questions/679304/problems-removing-or-installing-mysql-server-on-ubuntu-15-04-vivid-vervet

1 down vote
Alright, I tried something else, What I did was, Copied the backed up /etc/mysql folder from the old verison, renamed my.cnf to mysql.cnf, and ran 
    root@thegamingcorner:~# dpkg --configure -a
    Setting up mysql-server-5.6 (5.6.25-0ubuntu0.15.04.1) ...
    update-alternatives: warning: alternative /etc/mysql/my.cnf.fallback (part of link group my.cnf) doesn't exist; removing from list of alternatives
    update-alternatives: warning: forcing reinstallation of alternative /etc/mysql/mysql.cnf because link group my.cnf is broken
    2015-09-28 10:40:02 0 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
    2015-09-28 10:40:02 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
    2015-09-28 10:40:02 0 [Note] /usr/sbin/mysqld (mysqld 5.6.25-0ubuntu0.15

 

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