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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): The latest snap version
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04 LTS
Apache or nginx version (eg, Apache 2.4.25): Bundled with the snap
PHP version (eg, 7.1): Bundled with the snap
The issue you are facing: Unable to connect to server with browser
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Reboot server
- Restart nextcloud snap
- Try to connect with a browser
The output of your Nextcloud log in Admin > Logging:
pekka@FACEHUGGER:/var/snap/nextcloud/common$ sudo less nextcloud/data/nextcloud.log
{"reqId":"YSfZ3LrryvvcIwKocwiV","level":3,"time":"2019-11-01T09:21:19+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"fOW6mrBlFejsIlcX2Evg","level":3,"time":"2019-11-01T09:31:08+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"NnBC8oUnXWz1EzcyvLH2","level":3,"time":"2019-11-01T09:39:37+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/?dir=\/&","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"Qij4nmomz3z4X180kemC","level":3,"time":"2019-11-01T09:45:06+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"RM9EmvtWGFpl69uMB1B3","level":3,"time":"2019-11-01T09:46:28+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"PUwqisO1xaO0Qn0eQNzW","level":3,"time":"2019-11-01T11:30:43+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"XoXWJAjKJVXnF5we0kda","level":3,"time":"2019-11-01T11:31:26+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"93R9PrRk7XKWmmg9ZiaV","level":3,"time":"2019-11-01T11:33:43+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/news\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/news, file: index.php\/css\/news\/3eb1-469a-mobile.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"flGCdBe1h66EsIfk3DeC","level":3,"time":"2019-11-01T11:33:47+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
{"reqId":"AF4p1RBeL5IMzKk6c88n","level":3,"time":"2019-11-01T11:34:05+00:00","remoteAddr":"192.168.1.228","user":"pekka","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/var\/snap\/nextcloud\/16739\/nextcloud\/extra-apps\/spreed, file: index.php\/css\/spreed\/41bb-469a-merged-files.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko\/20100101 Firefox\/68.0","version":"16.0.5.1"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
pekka@FACEHUGGER:/var/snap/nextcloud/current/nextcloud/config$ sudo less config.php
<?php
$CONFIG = array (
'apps_paths' =>
array (
0 =>
array (
'path' => '/snap/nextcloud/current/htdocs/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/snap/nextcloud/current/nextcloud/extra-apps',
'url' => '/extra-apps',
'writable' => true,
),
),
'supportedDatabases' =>
array (
0 => 'mysql',
),
'memcache.locking' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/tmp/sockets/redis.sock',
'port' => 0,
),
'instanceid' => 'oc6z2a5jae0j',
'passwordsalt' => '**foo**',
'secret' => '**foo**',
'trusted_domains' =>
array (
0 => '**<server.url>**',
1 => '**192.168.X.XXX**',
),
'datadirectory' => '/var/snap/nextcloud/common/nextcloud/data',
'dbtype' => 'mysql',
'version' => '16.0.5.1',
'overwrite.cli.url' => '**<server.url>**',
config.php
The output of your Apache/nginx/system log in /var/log/____:
pekka@FACEHUGGER:/var/snap/nextcloud/current/apache$ sudo less logs/error_log
[Fri Nov 01 11:46:30.839382 2019] [unixd:alert] [pid 17868:tid 139648662804352] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:43:16.091107 2019] [mpm_event:notice] [pid 17746:tid 139648662804352] AH00491: caught SIGTERM, shutting down
[Fri Nov 01 12:43:33.231770 2019] [ssl:warn] [pid 7483:tid 140369178601344] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Fri Nov 01 12:43:33.239664 2019] [ssl:warn] [pid 7483:tid 140369178601344] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Fri Nov 01 12:43:33.240661 2019] [mpm_event:notice] [pid 7483:tid 140369178601344] AH00489: Apache/2.4.41 (Unix) OpenSSL/1.0.2g configured -- resuming normal operations
[Fri Nov 01 12:43:33.240704 2019] [core:notice] [pid 7483:tid 140369178601344] AH00094: Command line: 'httpd -d /snap/nextcloud/16739 -D EnableHTTPS -D EnableHSTS -D FOREGROUND'
[Fri Nov 01 12:43:33.241459 2019] [unixd:alert] [pid 7486:tid 140369178601344] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:43:33.241786 2019] [unixd:alert] [pid 7488:tid 140369178601344] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:43:33.241916 2019] [unixd:alert] [pid 7487:tid 140369178601344] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:44:13.280442 2019] [unixd:alert] [pid 8068:tid 140369178601344] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:44:16.806401 2019] [mpm_event:notice] [pid 7483:tid 140369178601344] AH00491: caught SIGTERM, shutting down
[Fri Nov 01 12:44:19.788060 2019] [ssl:warn] [pid 8739:tid 140503829616512] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Fri Nov 01 12:44:19.795912 2019] [ssl:warn] [pid 8739:tid 140503829616512] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Fri Nov 01 12:44:19.796917 2019] [mpm_event:notice] [pid 8739:tid 140503829616512] AH00489: Apache/2.4.41 (Unix) OpenSSL/1.0.2g configured -- resuming normal operations
[Fri Nov 01 12:44:19.796960 2019] [core:notice] [pid 8739:tid 140503829616512] AH00094: Command line: 'httpd -d /snap/nextcloud/16739 -D EnableHTTPS -D EnableHSTS -D FOREGROUND'
[Fri Nov 01 12:44:19.797930 2019] [unixd:alert] [pid 8743:tid 140503829616512] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:44:19.798062 2019] [unixd:alert] [pid 8742:tid 140503829616512] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:44:19.798125 2019] [unixd:alert] [pid 8744:tid 140503829616512] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
[Fri Nov 01 12:44:23.803039 2019] [unixd:alert] [pid 8980:tid 140503829616512] AH02155: getpwuid: couldn't determine user name from uid 4294967295, you probably need to modify the User directive
