MySQL数据迁移时无法设置root密码的问题求助

迁移场景与执行步骤 #

需迁移270GB MySQL数据（含datadir内的数据库及用户数据）至新服务器，为缩短停机时间采用rsync同步数据。两台服务器基于同一款Ubuntu AMI，仅数据存在差异。执行的迁移操作步骤如下：

sudo service mysql stop 
sudo apt-get purge mysql-server-5.5 mysql-common
sudo rm -rf /var/lib/mysql
sudo rm -rf /etc/mysql
sudo ln -s <path to datadir>/mysql /var/lib/mysql
sudo apt-get clean 
sudo apt-get purge mysql* 
sudo apt-get update 
sudo apt-get install -f 
sudo apt-get install mysql-server-5.5

出现的错误提示 #

安装mysql-server-5.5过程中设置root密码时，弹出错误：

Configuring mysql-server-5.5

Unable to set password for the MySQL "root" user

An error occurred while setting the password for the MySQL administrative
user. This may have happened because the account already has a password, or
because of a communication problem with the MySQL server.

You should check the account's password after the package installation.

Please read the /usr/share/doc/mysql-server-5.5/README.Debian file for more
information.

补充说明 #

• 同款AMI的开发服务器执行完全相同步骤可成功完成配置
• 两台服务器仅迁移的数据存在差异
• 明确Ubuntu及MySQL版本老旧，但此次迁移为必须操作且有严格时间限制

内容的提问来源于stack exchange，提问作者somya