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#Use
sudo apt-get -f install
# to fix your missing dependencies, then execute
sudo apt-get remove mssql-server
#to uninstall the server.
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$ sudo systemctl stop mysql
$ sudo apt-get remove --purge mysql-server mysql-client mysql-common -y
$ sudo apt-get autoremove -y
$ sudo apt-get autoclean
$ sudo rm -rf /etc/mysql /var/lib/mysql