嗨，在全新安装 ubuntu 16.04 和 tasksel 灯 apache2 后，每个人都收到此错误：
[Mon Jul 18 22:42:00.114578 2016] [core:warn] [pid 4654] AH00111: Config variable ${APACHE_LOCK_DIR} is not defined
[Mon Jul 18 22:42:00.114623 2016] [core:warn] [pid 4654] AH00111: Config variable ${APACHE_PID_FILE} is not defined
[Mon Jul 18 22:42:00.114641 2016] [core:warn] [pid 4654] AH00111: Config variable ${APACHE_RUN_USER} is not defined
[Mon Jul 18 22:42:00.114645 2016] [core:warn] [pid 4654] AH00111: Config variable ${APACHE_RUN_GROUP} is not defined
[Mon Jul 18 22:42:00.114657 2016] [core:warn] [pid 4654] AH00111: Config variable ${APACHE_LOG_DIR} …