Deleting old MySQL data

.travis.yml

@@ -5,11 +5,12 @@ python:
   - 3.7
 before_install:
   - sudo apt remove *mysql*
+  - sudo rm -rf /var/lib/mysql
   - sudo apt install software-properties-common gnupg-curl apt-transport-https
   - sudo apt-key adv --fetch-keys 'http://mariadb.org/mariadb_release_signing_key.asc'
   - sudo add-apt-repository 'deb [arch=amd64,arm64,i386,ppc64el] http://mariadb.mirrors.ovh.net/MariaDB/repo/10.5/ubuntu xenial main'
   - sudo apt update
-  - sudo apt install mariadb-client mariadb-server mariadb-common libmariadb-dev libmariadb3
+  - sudo apt install mariadb-client mariadb-server libmariadb-dev libmariadb3
   - mysql --version
   - sudo mariadb-upgrade
   - sudo sed -i '/\[mysqld\]/ a default_time_zone='"'"'+1:00'"'"'\nevent_scheduler=ON\nuserstat=1\nperformance_schema=ON' /etc/mysql/mariadb.conf.d/50-server.cnf