You were importing a large SQL file into a MySQL database and you encountered this error: You probably tried to upload a file that is too large. Please refer to documentation for a workaround for this limit. Fret not.
Here is the list of steps to accomplish the task:
1. Open the file php.ini in the directory /etc/php/7.2/apache2.
$ sudo gedit /etc/php/7.2/apache2/php.ini
2. Look for the following lines and change their values to the ones on their right.
upload_max_filesize 100M post_max_size 100M max_execution_time 500 max_input_time 500
3. Save the changes.
4. Restart Apache.
$ sudo service apache2 restart