我在Apache2上部署了Ruby on Rails（如何： http : //www.modrails.com/videos/passenger.mov ）
并在我重新启动Apache后，错误出来
[Wed Oct 21 00:45:48.781816 2015] [core:warn] [pid 10994] AH00111: Config variable ${APACHE_LOCK_DIR} is not defined [Wed Oct 21 00:45:48.781905 2015] [core:warn] [pid 10994] AH00111: Config variable ${APACHE_PID_FILE} is not defined [Wed Oct 21 00:45:48.781931 2015] [core:warn] [pid 10994] AH00111: Config variable ${APACHE_RUN_USER} is not defined [Wed Oct 21 00:45:48.781945 2015] [core:warn] [pid 10994] AH00111: Config variable ${APACHE_RUN_GROUP} is not defined [Wed Oct 21 00:45:48.781967 2015] [core:warn] [pid 10994] AH00111: Config variable ${APACHE_LOG_DIR} is not defined [Wed Oct 21 00:45:48.785039 2015] [core:warn] [pid 10994:tid 3074509440] AH00111: Config variable ${APACHE_LOG_DIR} is not defined [Wed Oct 21 00:45:48.785239 2015] [core:warn] [pid 10994:tid 3074509440] AH00111: Config variable ${APACHE_LOG_DIR} is not defined [Wed Oct 21 00:45:48.785261 2015] [core:warn] [pid 10994:tid 3074509440] 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}
我曾看过这个 ，没有工作..（操作系统是Xubuntu）