sudo debconf-set-selections <<< 'MysqL-server MysqL-server/root_password password your_password'
sudo debconf-set-selections <<< 'MysqL-server MysqL-server/root_password_again password your_password'
sudo apt-get -y install MysqL-server
对于特定版本，例如MysqL-server-5.6，您需要像这样指定版本：
sudo debconf-set-selections <<< 'MysqL-server-5.6 MysqL-server/root_password password your_password'
sudo debconf-set-selections <<< 'MysqL-server-5.6 MysqL-server/root_password_again password your_password'
sudo apt-get -y install MysqL-server-5.6
对于MysqL-community-server，密钥略有不同：
sudo debconf-set-selections <<< 'MysqL-community-server MysqL-community-server/root-pass password your_password'
sudo debconf-set-selections <<< 'MysqL-community-server MysqL-community-server/re-root-pass password your_password'
sudo apt-get -y install MysqL-community-server
将your_password替换为所需的root密码。（似乎your_password也可以留空以获取空白的root密码。）
如果您的外壳不支持 此处字符串 （ zsh ， ksh93 和 bash 支持它们），请使用：
echo ... | sudo debconf-set-selections
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