Se você estiver usando o Ubuntu 15.04 ou mais recente, tente sudo systemctl start mysql
ou, em geral, sudo systemctl <action> <service-name>
para controlar daemons.
minzaw@Dell-PC:~$ sudo start mysql
[sudo] password for minzaw:
start: *Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused*
minzaw@Dell-PC:~$ sudo restart mysql
restart: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
Se você estiver usando o Ubuntu 15.04 ou mais recente, tente sudo systemctl start mysql
ou, em geral, sudo systemctl <action> <service-name>
para controlar daemons.