ubuntu 15.04 x64 mysql安装失败

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● mysql.service - LSB: start and stop MySQL
   Loaded: loaded (/etc/init.d/mysql)
   Active: failed (Result: exit-code) since Sun 2015-06-07 16:07:22 CST; 453ms ago
     Docs: man:systemd-sysv-generator(8)



Jun 07 16:07:19 demo systemd[1]: Starting LSB: start and stop MySQL...
Jun 07 16:07:19 demo mysql[17114]: Starting MySQL
Jun 07 16:07:22 demo mysql[17114]: .. * The server quit without updating PID file (/usr/local/mysql/var/demo.pid).
Jun 07 16:07:22 demo systemd[1]: mysql.service: control process exited, code=exited status=1
Jun 07 16:07:22 demo systemd[1]: Failed to start LSB: start and stop MySQL.
Jun 07 16:07:22 demo systemd[1]: Unit mysql.service entered failed state.
Jun 07 16:07:22 demo systemd[1]: mysql.service failed.
Active Internet connections (only servers)

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root@demo:/usr/local/mysql/var# cat demo.err
150607 16:07:19 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
Killed
150607 16:07:21 mysqld_safe mysqld from pid file /usr/local/mysql/var/demo.pid ended
150607 16:40:56 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
Killed
150607 16:40:58 mysqld_safe mysqld from pid file /usr/local/mysql/var/demo.pid ended
150607 16:42:46 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
Killed
150607 16:42:46 mysqld_safe mysqld from pid file /usr/local/mysql/var/demo.pid ended
150607 16:44:37 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
Killed
150607 16:44:37 mysqld_safe mysqld from pid file /usr/local/mysql/var/demo.pid ended
150607 16:49:23 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
Killed
150607 16:49:23 mysqld_safe mysqld from pid file /usr/local/mysql/var/demo.pid ended

licess

这里面没有错误信息

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