While starting mysql server 5.7.17 using mysqld_safe, following error occcours.
2017-02-10T17:05:44.870970Z mysqld_safe Logging to \'/var/log/mysql/error.log
You may try the following if your database does not have any data OR you have another away to restore that data. You will need to know the Ubuntu server root password but not the mysql root password.
It is highly probably that many of us have installed "mysql_secure_installation" as this is a best practice. Navigate to bin directory where mysql_secure_installation exist. It can be found in the /bin directory on Ubuntu systems. By rerunning the installer, you will be prompted about whether to change root database password.