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Невозможно запустить сервер Apache2 после того, как я изменил файл dir.conf, даже после его возврата к нормальному состоянию

Я изменил /etc/apache2/mods-enabled/dir.conf и изменил порядок и написал index.php в первую очередь перед index.html , таким образом, содержимое файла было изменено из «DirectoryIndex index.php index.html индекс.cgi index.pl index.xhtml index.htm Индекс директории » до настоящего времени » index.php index.html индекс.cgi index.pl индекс.xhtml index.htm «. Но все же изменение этого обратно в исходный порядок также не запускает сервер apache2, он выдает ту же ошибку. Я попытался перезапустить, остановить и запустить, но, похоже, ничего не работает.

 ** Here are the details of systemctl status apache2.service **

● apache2.service - LSB: Apache2 web server
   Loaded: loaded (/etc/init.d/apache2; bad; vendor preset: enabled)
  Drop-In: /lib/systemd/system/apache2.service.d
           └─apache2-systemd.conf
   Active: failed (Result: exit-code) since Tue 2020-11-24 12:28:31 IST; 5min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 20300 ExecStop=/etc/init.d/apache2 stop (code=exited, status=0/SUCCESS)
  Process: 25755 ExecStart=/etc/init.d/apache2 start (code=exited, status=1/FAILURE)

Nov 24 12:28:31 localhost apache2[25755]:  *
Nov 24 12:28:31 localhost apache2[25755]:  * The apache2 configtest failed.
Nov 24 12:28:31 localhost apache2[25755]: Output of config test was:
Nov 24 12:28:31 localhost apache2[25755]: AH00534: apache2: Configuration error: More than one MPM loaded.
Nov 24 12:28:31 localhost apache2[25755]: Action 'configtest' failed.
Nov 24 12:28:31 localhost apache2[25755]: The Apache error log may have more information.
Nov 24 12:28:31 localhost systemd[1]: apache2.service: Control process exited, code=exited status=1
Nov 24 12:28:31 localhost systemd[1]: Failed to start LSB: Apache2 web server.
Nov 24 12:28:31 localhost systemd[1]: apache2.service: Unit entered failed state.
Nov 24 12:28:31 localhost systemd[1]: apache2.service: Failed with result 'exit-code'.
 

 **Here is the details of journalctl -xe**

Nov 24 12:44:42 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:75]
Nov 24 12:44:42 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:77]
Nov 24 12:44:43 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:75]
Nov 24 12:44:43 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:77]
Nov 24 12:44:44 localhost systemd[1]: Failed to start MySQL Community Server.
-- Subject: Unit mysql.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has failed.
-- 
-- The result is failed.
Nov 24 12:44:44 localhost systemd[1]: mysql.service: Unit entered failed state.
Nov 24 12:44:44 localhost systemd[1]: mysql.service: Failed with result 'exit-code'.
Nov 24 12:44:44 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:75]
Nov 24 12:44:44 localhost systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
Nov 24 12:44:44 localhost systemd[1]: Stopped MySQL Community Server.
-- Subject: Unit mysql.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has finished shutting down.
Nov 24 12:44:44 localhost systemd[1]: Starting MySQL Community Server...
-- Subject: Unit mysql.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has begun starting up.
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.545855Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.545908Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.705792Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --expl
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.707018Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.32-0ubuntu0.16.04.1) starting as process 538
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.709650Z 0 [ERROR] Could not open file '/var/log/mysql/error.log' for error logging: No suc
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.709678Z 0 [ERROR] Aborting
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.709703Z 0 [Note] Binlog end
Nov 24 12:44:44 localhost mysqld[5387]: 2020-11-24T07:14:44.709770Z 0 [Note] /usr/sbin/mysqld: Shutdown complete
Nov 24 12:44:44 localhost systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
Nov 24 12:44:44 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:77]
Nov 24 12:44:44 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:75]
Nov 24 12:44:45 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:77]
Nov 24 12:44:45 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:75]
Nov 24 12:44:45 localhost kernel: [drm:drm_mode_addfb2 [drm]] [FB:77]