2016-03-14 02:30:29 58150 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 35 2016-03-14 02:30:29 58150 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
First, list MySQL processes using the ps command:
ps aux | grep mysql
And then kill the process
sudo kill 56311