ubuntu@ip-172-31-45-140:~$ sudo apt purge mysql*
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'mysqltcl' for glob 'mysql*'
Note, selecting 'mysql-mmm-agent' for glob 'mysql*'
Note, selecting 'mysql-workbench' for glob 'mysql*'
Note, selecting 'mysql-client-5.5' for glob 'mysql*'
Note, selecting 'mysql-client-5.6' for glob 'mysql*'
Note, selecting 'mysql-client-5.7' for glob 'mysql*'
Note, selecting 'mysql-mmm-tools' for glob 'mysql*'
Note, selecting 'mysql-common-5.6' for glob 'mysql*'
Note, selecting 'mysql-server-5.0' for glob 'mysql*'
Note, selecting 'mysql-server-5.1' for glob 'mysql*'
Note, selecting 'mysql-server-5.5' for glob 'mysql*'
Note, selecting 'mysql-server-5.6' for glob 'mysql*'
Note, selecting 'mysql-server-5.7' for glob 'mysql*'
Note, selecting 'mysql-utilities' for glob 'mysql*'
Note, selecting 'mysql-testsuite' for glob 'mysql*'
Note, selecting 'mysql-mmm-common' for glob 'mysql*'
Note, selecting 'mysql-server' for glob 'mysql*'
Note, selecting 'mysql-client' for glob 'mysql*'
Note, selecting 'mysql-sandbox' for glob 'mysql*'
Note, selecting 'mysql-client-core-5.5' for glob 'mysql*'
Note, selecting 'mysql-client-core-5.6' for glob 'mysql*'
Note, selecting 'mysql-client-core-5.7' for glob 'mysql*'
Note, selecting 'mysql-testsuite-5.5' for glob 'mysql*'
Note, selecting 'mysql-testsuite-5.6' for glob 'mysql*'
Note, selecting 'mysql-testsuite-5.7' for glob 'mysql*'
Note, selecting 'mysql-common' for glob 'mysql*'
Note, selecting 'mysql-mmm-monitor' for glob 'mysql*'
Note, selecting 'mysqltuner' for glob 'mysql*'
Note, selecting 'mysql-workbench-data' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.1' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.5' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.6' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.7' for glob 'mysql*'
Note, selecting 'mysql-source-5.7' for glob 'mysql*'
Package 'mysql-client-5.5' is not installed, so not removed
Package 'mysql-client-5.6' is not installed, so not removed
Package 'mysql-server-core-5.6' is not installed, so not removed
Package 'mysql-client-core-5.5' is not installed, so not removed
Package 'mysql-client-core-5.6' is not installed, so not removed
Note, selecting 'mysql-common' instead of 'mysql-common-5.6'
Package 'mysql-server-5.5' is not installed, so not removed
Package 'mysql-server-5.6' is not installed, so not removed
Package 'mysql-server-core-5.5' is not installed, so not removed
Package 'mysql-testsuite-5.5' is not installed, so not removed
Package 'mysql-testsuite-5.6' is not installed, so not removed
Package 'mysql-server-5.0' is not installed, so not removed
Package 'mysql-server-5.1' is not installed, so not removed
Package 'mysql-server-core-5.1' is not installed, so not removed
Package 'mysql-mmm-agent' is not installed, so not removed
Package 'mysql-mmm-common' is not installed, so not removed
Package 'mysql-mmm-monitor' is not installed, so not removed
Package 'mysql-mmm-tools' is not installed, so not removed
Package 'mysql-sandbox' is not installed, so not removed
Package 'mysql-utilities' is not installed, so not removed
Package 'mysql-workbench' is not installed, so not removed
Package 'mysql-workbench-data' is not installed, so not removed
Package 'mysqltcl' is not installed, so not removed
Package 'mysqltuner' is not installed, so not removed
Package 'mysql-server-5.7' is not installed, so not removed
Package 'mysql-source-5.7' is not installed, so not removed
Package 'mysql-testsuite' is not installed, so not removed
Package 'mysql-testsuite-5.7' is not installed, so not removed
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 dbconfig-mysql : Depends: mysql-client but it is not going to be installed or
                           mariadb-client but it is not going to be installed or
                           virtual-mysql-client
 libmysqlclient20 : Depends: mysql-common (>= 5.5) but it is not going to be installed
 mariadb-common : Depends: mysql-common (>= 5.6.25) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
ubuntu@ip-172-31-45-140:~$ rm -rf /etc/mysql
rm: cannot remove '/etc/mysql/mariadb.cnf': Permission denied
rm: cannot remove '/etc/mysql/my.cnf.fallback': Permission denied
rm: cannot remove '/etc/mysql/debian.cnf': Permission denied
rm: cannot remove '/etc/mysql/conf.d/mysqldump.cnf': Permission denied
rm: cannot remove '/etc/mysql/conf.d/mysql.cnf': Permission denied
rm: cannot remove '/etc/mysql/my.cnf': Permission denied
rm: cannot remove '/etc/mysql/debian-start': Permission denied
rm: cannot remove '/etc/mysql/mariadb.conf.d/50-server.cnf': Permission denied
rm: cannot remove '/etc/mysql/mariadb.conf.d/50-mysql-clients.cnf': Permission denied
rm: cannot remove '/etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf': Permission denied
rm: cannot remove '/etc/mysql/mariadb.conf.d/50-client.cnf': Permission denied
ubuntu@ip-172-31-45-140:~$ sudo rm -rf /etc/mysql
ubuntu@ip-172-31-45-140:~$ sudo rm -rf /var/lib/mysql
ubuntu@ip-172-31-45-140:~$ sudo rm -rf /var/lib/mysql-files
ubuntu@ip-172-31-45-140:~$ sudo rm -rf /var/lib/mysql-kering