I can't see button's img

Nextcloud version 18.0.3:
Operating system and version Ubuntu 19.04:
Apache or nginx version Apache 2.4.25:
PHP version 7.2:

The issue you are facing:

After I set up my nextcloud, I found that some button’s img isn’t shown.


Like the upload button, I can’t see a “+” in it.

I have tried to reboot my server, but the issue still here.

Is this the first time you’ve seen this error? Yes:

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => 'ocg43gc****',
  'passwordsalt' => '1QNlLfGMrpB*****',
  'secret' => '0UPLFTPAS5Hh44m*****',
  'trusted_domains' => 
  array (
    0 => 'cloud.***',
  ),
  'datadirectory' => '/var/www/html/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '18.0.3.0',
  'overwrite.cli.url' => 'https://cloud.***/nextcloud',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '****',
  'installed' => true,
  'updater.release.channel' => 'beta',
  'updater.secret' => '$2y$10$.aJuggbXcXwygDYcbPXoPOInrypc1un7gbo.Wv8a******',
  'maintenance' => false,
  'loglevel' => 2,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'enabledPreviewProviders' =>
  array (
    0 => 'OC\\Preview\\PNG',
    1 => 'OC\\Preview\\JPEG',
    2 => 'OC\\Preview\\GIF',
    3 => 'OC\\Preview\\HEIC',
    4 => 'OC\\Preview\\BMP',
    5 => 'OC\\Preview\\XBitmap',
    6 => 'OC\\Preview\\MP3',
    7 => 'OC\\Preview\\TXT',
    8 => 'OC\\Preview\\MarkDown',
    9 => 'OC\\Preview\\Movie',
    10 => 'OC\\Preview\\SVG'
  ),
);

The output of your Apache/nginx/system log in /var/log/____:

[Thu Apr 02 07:30:19.405892 2020] [mpm_event:notice] [pid 1578:tid 139950463470528] AH00489: Apache/2.4.38 (Ubuntu) configured -- resuming normal operations
[Thu Apr 02 07:30:19.407523 2020] [core:notice] [pid 1578:tid 139950463470528] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:31:11.149755 2020] [mpm_event:notice] [pid 1578:tid 139950463470528] AH00491: caught SIGTERM, shutting down
[Thu Apr 02 07:31:11.276492 2020] [mpm_prefork:notice] [pid 7975] AH00163: Apache/2.4.38 (Ubuntu) configured -- resuming normal operations
[Thu Apr 02 07:31:11.276644 2020] [core:notice] [pid 7975] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:31:12.176365 2020] [mpm_prefork:notice] [pid 7975] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 07:31:12.369801 2020] [mpm_prefork:notice] [pid 8033] AH00163: Apache/2.4.38 (Ubuntu) configured -- resuming normal operations
[Thu Apr 02 07:31:12.369911 2020] [core:notice] [pid 8033] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:34:09.900054 2020] [mpm_prefork:notice] [pid 8033] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 07:34:10.101589 2020] [mpm_prefork:notice] [pid 9693] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 07:34:10.101717 2020] [core:notice] [pid 9693] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:36:11.994828 2020] [authz_core:error] [pid 9694] [client 43.225.171.247:59972] AH01630: client denied by server configuration: /var/www/html/
[Thu Apr 02 07:37:52.600605 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/index.php
[Thu Apr 02 07:37:53.723780 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/favicon.ico, referer: http://45.220.67.109/index.php/settings/admin/serverinfo
[Thu Apr 02 07:37:57.138279 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/
[Thu Apr 02 07:37:57.687570 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/favicon.ico, referer: http://45.220.67.109/
[Thu Apr 02 07:37:59.745774 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/
[Thu Apr 02 07:38:00.298451 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/favicon.ico, referer: http://45.220.67.109/
[Thu Apr 02 07:38:01.725041 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/
[Thu Apr 02 07:38:02.232062 2020] [authz_core:error] [pid 9698] [client 199.193.124.75:33642] AH01630: client denied by server configuration: /var/www/html/favicon.ico, referer: http://45.220.67.109/
[Thu Apr 02 07:38:14.438927 2020] [mpm_prefork:notice] [pid 9693] AH00171: Graceful restart requested, doing restart
AH00557: apache2: apr_sockaddr_info_get() failed for 200326-6RMX
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message
[Thu Apr 02 07:38:15.099707 2020] [mpm_prefork:notice] [pid 9693] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 07:38:15.099743 2020] [core:notice] [pid 9693] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:40:13.452381 2020] [mpm_prefork:notice] [pid 9693] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 07:40:13.779278 2020] [mpm_prefork:notice] [pid 15380] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 07:40:13.779418 2020] [core:notice] [pid 15380] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:45:33.231284 2020] [mpm_prefork:notice] [pid 15380] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 07:45:33.531698 2020] [mpm_prefork:notice] [pid 15444] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 07:45:33.531853 2020] [core:notice] [pid 15444] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:45:41.806939 2020] [authz_core:error] [pid 15446] [client 199.193.124.75:41032] AH01630: client denied by server configuration: /var/www/html/nextcloud/
[Thu Apr 02 07:45:43.714416 2020] [authz_core:error] [pid 15446] [client 199.193.124.75:41032] AH01630: client denied by server configuration: /var/www/html/favicon.ico, referer: http://45.220.67.109/nextcloud/
[Thu Apr 02 07:46:48.459370 2020] [mpm_prefork:notice] [pid 15444] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 07:46:48.735303 2020] [mpm_prefork:notice] [pid 15477] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 07:46:48.735413 2020] [core:notice] [pid 15477] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:54:34.357508 2020] [mpm_prefork:notice] [pid 15477] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 07:54:34.776364 2020] [mpm_prefork:notice] [pid 15576] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 07:54:34.776537 2020] [core:notice] [pid 15576] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 07:54:38.679084 2020] [core:alert] [pid 15582] [client 199.193.124.75:56232] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 07:55:50.362673 2020] [core:alert] [pid 15579] [client 199.193.124.75:33600] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 07:59:41.955623 2020] [core:alert] [pid 15590] [client 199.193.124.75:53096] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 08:00:22.959285 2020] [core:alert] [pid 15577] [client 199.193.124.75:57728] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 08:08:03.224559 2020] [core:alert] [pid 15581] [client 199.193.124.75:43780] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 08:08:09.644613 2020] [core:alert] [pid 15590] [client 199.193.124.75:44428] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 08:08:57.968414 2020] [core:alert] [pid 15593] [client 199.193.124.75:48708] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 08:25:18.955800 2020] [core:alert] [pid 15592] [client 199.193.124.75:39296] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 09:10:00.675939 2020] [core:alert] [pid 15616] [client 199.193.124.75:37174] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 09:10:21.889320 2020] [php7:error] [pid 15870] [client 199.193.124.75:38472] PHP Fatal error:  Uncaught Exception: Could not do request to updater server: Could not resolve host: updates.nextcloud.com in /var/www/html/nextcloud/updater/index.php:592\nStack trace:\n#0 /var/www/html/nextcloud/updater/index.php(236): Updater->getUpdateServerResponse()\n#1 /var/www/html/nextcloud/updater/index.php(1702): Updater->checkForUpdate()\n#2 {main}\n  thrown in /var/www/html/nextcloud/updater/index.php on line 592
[Thu Apr 02 09:10:43.635267 2020] [php7:error] [pid 15696] [client 199.193.124.75:38512] PHP Fatal error:  Uncaught Exception: Could not do request to updater server:  in /var/www/html/nextcloud/updater/index.php:592\nStack trace:\n#0 /var/www/html/nextcloud/updater/index.php(236): Updater->getUpdateServerResponse()\n#1 /var/www/html/nextcloud/updater/index.php(1702): Updater->checkForUpdate()\n#2 {main}\n  thrown in /var/www/html/nextcloud/updater/index.php on line 592
[Thu Apr 02 09:10:51.414298 2020] [core:alert] [pid 15616] [client 199.193.124.75:39770] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 09:11:05.666812 2020] [php7:error] [pid 15593] [client 199.193.124.75:40298] PHP Fatal error:  Uncaught Exception: Could not do request to updater server:  in /var/www/html/nextcloud/updater/index.php:592\nStack trace:\n#0 /var/www/html/nextcloud/updater/index.php(236): Updater->getUpdateServerResponse()\n#1 /var/www/html/nextcloud/updater/index.php(1702): Updater->checkForUpdate()\n#2 {main}\n  thrown in /var/www/html/nextcloud/updater/index.php on line 592
[Thu Apr 02 09:11:41.558619 2020] [php7:error] [pid 15592] [client 199.193.124.75:40294] PHP Fatal error:  Uncaught Exception: Could not do request to updater server:  in /var/www/html/nextcloud/updater/index.php:592\nStack trace:\n#0 /var/www/html/nextcloud/updater/index.php(236): Updater->getUpdateServerResponse()\n#1 /var/www/html/nextcloud/updater/index.php(1702): Updater->checkForUpdate()\n#2 {main}\n  thrown in /var/www/html/nextcloud/updater/index.php on line 592
[Thu Apr 02 09:11:48.188267 2020] [core:alert] [pid 15696] [client 199.193.124.75:42802] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 09:15:44.625208 2020] [php7:error] [pid 15592] [client 199.193.124.75:55014] PHP Fatal error:  Uncaught Exception: Could not do request to updater server:  in /var/www/html/nextcloud/updater/index.php:592\nStack trace:\n#0 /var/www/html/nextcloud/updater/index.php(236): Updater->getUpdateServerResponse()\n#1 /var/www/html/nextcloud/updater/index.php(1702): Updater->checkForUpdate()\n#2 {main}\n  thrown in /var/www/html/nextcloud/updater/index.php on line 592
[Thu Apr 02 09:15:53.189139 2020] [core:alert] [pid 15589] [client 199.193.124.75:57138] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 09:18:52.571467 2020] [core:alert] [pid 15593] [client 199.193.124.75:40304] /var/www/html/nextcloud/data/.htaccess: Expected </IifModule> but saw </IfModule>
[Thu Apr 02 09:22:07.288214 2020] [access_compat:error] [pid 15593] [client 199.193.124.75:52820] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 09:27:22.052167 2020] [mpm_prefork:notice] [pid 15576] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 09:27:22.392176 2020] [mpm_prefork:notice] [pid 16566] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 09:27:22.392344 2020] [core:notice] [pid 16566] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 09:28:45.319477 2020] [access_compat:error] [pid 16570] [client 199.193.124.75:49720] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 09:31:18.123221 2020] [access_compat:error] [pid 16570] [client 199.193.124.75:60752] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 09:36:57.408345 2020] [mpm_prefork:notice] [pid 16566] AH00171: Graceful restart requested, doing restart
AH00112: Warning: DocumentRoot [/usr/local/ServerStatus/web] does not exist
AH00557: apache2: apr_sockaddr_info_get() failed for JayGuo-LA
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message
[Thu Apr 02 09:36:58.195027 2020] [ssl:warn] [pid 16566] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 09:36:58.195292 2020] [mpm_prefork:notice] [pid 16566] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 09:36:58.195304 2020] [core:notice] [pid 16566] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 09:37:29.967316 2020] [mpm_prefork:notice] [pid 16566] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 09:37:30.124539 2020] [ssl:warn] [pid 16785] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 09:37:30.235471 2020] [ssl:warn] [pid 16787] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 09:37:30.253258 2020] [mpm_prefork:notice] [pid 16787] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 09:37:30.266559 2020] [core:notice] [pid 16787] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 09:38:05.904888 2020] [authz_core:error] [pid 16789] [client 199.193.124.75:59682] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:38:06.914519 2020] [authz_core:error] [pid 16789] [client 199.193.124.75:59682] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:38:16.477203 2020] [authz_core:error] [pid 16791] [client 199.193.124.75:59686] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:50:48.427654 2020] [access_compat:error] [pid 16918] [client 199.193.124.75:60604] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 09:51:22.797053 2020] [access_compat:error] [pid 16943] [client 199.193.124.75:34554] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 09:53:13.147305 2020] [authz_core:error] [pid 16866] [client 59.41.182.204:26505] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:53:14.597602 2020] [authz_core:error] [pid 16793] [client 59.41.182.204:26518] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:53:14.861259 2020] [authz_core:error] [pid 16793] [client 59.41.182.204:26518] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:53:30.991856 2020] [authz_core:error] [pid 16936] [client 59.41.182.204:26543] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:53:31.208286 2020] [authz_core:error] [pid 16936] [client 59.41.182.204:26543] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 09:56:41.738730 2020] [authz_core:error] [pid 16944] [client 103.12.161.242:42870] AH01630: client denied by server configuration: /usr/local/ServerStatus
[Thu Apr 02 10:04:40.580866 2020] [access_compat:error] [pid 16938] [client 199.193.124.75:41460] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 10:37:03.727771 2020] [access_compat:error] [pid 16938] [client 199.193.124.75:39564] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 10:37:21.453537 2020] [access_compat:error] [pid 16943] [client 59.41.182.204:28488] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 10:41:13.143460 2020] [mpm_prefork:notice] [pid 16787] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 10:41:13.355147 2020] [ssl:warn] [pid 20855] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 10:41:13.477701 2020] [ssl:warn] [pid 20862] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 10:41:13.507232 2020] [mpm_prefork:notice] [pid 20862] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 10:41:13.507312 2020] [core:notice] [pid 20862] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 10:55:07.191811 2020] [access_compat:error] [pid 20873] [client 199.193.124.75:43118] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 10:58:02.117051 2020] [access_compat:error] [pid 20874] [client 199.193.124.75:55760] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:03:02.634849 2020] [access_compat:error] [pid 20873] [client 199.193.124.75:47554] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:03:32.578509 2020] [mpm_prefork:notice] [pid 20862] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 11:03:51.860688 2020] [ssl:warn] [pid 22360] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 11:03:52.319427 2020] [ssl:warn] [pid 22364] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 11:03:52.348069 2020] [mpm_prefork:notice] [pid 22364] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 11:03:52.348135 2020] [core:notice] [pid 22364] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 11:03:59.202845 2020] [access_compat:error] [pid 22367] [client 199.193.124.75:51698] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:06:09.617703 2020] [mpm_prefork:notice] [pid 22364] AH00169: caught SIGTERM, shutting down
[Thu Apr 02 11:06:30.784083 2020] [ssl:warn] [pid 571] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 11:06:31.766815 2020] [ssl:warn] [pid 652] AH01909: cloyd.jayguo.cn:443:0 server certificate does NOT include an ID which matches the server name
[Thu Apr 02 11:06:31.856864 2020] [mpm_prefork:notice] [pid 652] AH00163: Apache/2.4.38 (Ubuntu) OpenSSL/1.1.1b configured -- resuming normal operations
[Thu Apr 02 11:06:31.856954 2020] [core:notice] [pid 652] AH00094: Command line: '/usr/sbin/apache2'
[Thu Apr 02 11:08:29.065830 2020] [access_compat:error] [pid 759] [client 59.41.182.204:27011] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:08:50.241150 2020] [access_compat:error] [pid 882] [client 59.41.182.204:27028] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:18:44.799056 2020] [authz_core:error] [pid 1467] [client 192.241.239.43:35374] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 11:19:35.145040 2020] [authz_core:error] [pid 770] [client 77.247.108.119:46136] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 11:24:30.594076 2020] [access_compat:error] [pid 1107] [client 59.41.182.204:28173] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:25:55.262878 2020] [access_compat:error] [pid 1107] [client 59.41.182.204:28310] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 11:27:25.118655 2020] [access_compat:error] [pid 2268] [client 59.41.182.204:28378] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 12:03:08.728041 2020] [access_compat:error] [pid 2455] [client 199.193.124.75:52078] AH01797: client denied by server configuration: /var/www/html/nextcloud/data/.ocdata
[Thu Apr 02 12:04:46.781363 2020] [authz_core:error] [pid 6623] [client 59.41.182.204:28844] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:04:47.335351 2020] [authz_core:error] [pid 6623] [client 59.41.182.204:28844] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:06:58.913046 2020] [authz_core:error] [pid 908] [client 171.67.70.85:34044] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:49.721678 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:49.956120 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:50.184462 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:50.415337 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:50.647440 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:50.876482 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:51.101793 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:18:51.332819 2020] [authz_core:error] [pid 658] [client 59.41.182.204:25910] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:46.106633 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:46.316536 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:46.525645 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:46.735144 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:46.968982 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:47.200123 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:19:47.418777 2020] [authz_core:error] [pid 6859] [client 59.41.182.204:25992] AH01630: client denied by server configuration: /usr/local/ServerStatus/web
[Thu Apr 02 12:21:38.639591 2020] [authz_core:error] [pid 908] [client 113.128.104.152:37072] AH01630: client denied by server configuration: /usr/local/ServerStatus/web

No idea. But two annotations.

1.)
You should use on a production system an Ubuntu LTS - release like Ubuntu 18.04 LTS or in a month Ubuntu 20.04 LTS with update every two years. You can also use Debian with two years or perhaps CentOS with more years.
2.)
You should if possible not use a subdir like /nextcloud in the url. If you use the server for another webservice you can use virtual hosts with different names.