Following this tutorial, I'm getting
# sudo service mysqld start
Failed to start mysqld.service: Unit mysqld.service failed to load: No such file or directory.
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WARNING: This solution will destroy any DB data you have. DO NOT use it if you have DB data you intend to keep!
I got stuck with the same issue and I uninstalled and installed again by following the following commands:
sudo apt-get --purge remove mysql-server mysql-common mysql-client.
sudo apt update && sudo apt dist-upgrade && sudo apt autoremove.
sudo apt-get install -y mysql-server mysql-client.