参数文件中的无效Mutex目录：$ {APACHE_LOCK_DIR}

当我从命令行运行apache2（运行命令，而不是服务），我有这样的：

[Thu Mar 13 12:18:05.594522 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_LOCK_DIR} is not defined [Thu Mar 13 12:18:05.594732 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_PID_FILE} is not defined [Thu Mar 13 12:18:05.594807 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_RUN_USER} is not defined [Thu Mar 13 12:18:05.594867 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_RUN_GROUP} is not defined [Thu Mar 13 12:18:05.594934 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_LOG_DIR} is not defined [Thu Mar 13 12:18:05.617353 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_LOG_DIR} is not defined [Thu Mar 13 12:18:05.617809 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_LOG_DIR} is not defined [Thu Mar 13 12:18:05.617895 2014] [core:warn] [pid 9268] AH00111: Config variable ${APACHE_LOG_DIR} is not defined AH00526: Syntax error on line 74 of /etc/apache2/apache2.conf: Invalid Mutex directory in argument file:${APACHE_LOCK_DIR} 

线74是：

 Mutex file:${APACHE_LOCK_DIR} default 

我已经从13.04更新了Xubuntu到13.10，它有Apache / 2.4.6

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 service apache2 start