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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): 12.0.7.1
Operating system and version (eg, Ubuntu 17.04): Debian 9.4
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.25
PHP version (eg, 7.1): 7.0.27
The issue you are facing:
After weekly apt-get update and upgrade, noticed NextCloud no longer accessible “Internal Server Error”, apache2 is running. When I view nextcloud.log, I get the generic:
General error: 11 database disk image is malformed
Doing some Googling, figured I’d do a restore by stopping Apache, then running:
sqlite3 owncloud.db < nextcloud-sqlbkp_Tue.bak
Then move file into data directory, restart, same error
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Start apache
The output of your Nextcloud log in Admin > Logging:
{"reqId":"QxaO5LyO4Hs8SRxoDvnc","level":4,"time":"2018-06-07T23:06:13+00:00","remoteAddr":"my_ip","user":"--","app":"webdav","method":"PROPFIND","url":"\/nextcloud\/remote.php\/dav\/files\/southhendo\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\ServiceUnavailable\",\"Message\":\"Doctrine\\\\DBAL\\\\Exception\\\\DriverException: An exception occurred while executing 'SELECT \\\"id\\\", \\\"uid\\\", \\\"login_name\\\", \\\"password\\\", \\\"name\\\", \\\"type\\\", \\\"remember\\\", \\\"token\\\", \\\"last_activity\\\", \\\"last_check\\\", \\\"scope\\\" FROM \\\"oc_authtoken\\\" WHERE \\\"token\\\" = ?' with params [\\\"hidden"]:\\n\\nSQLSTATE[HY000]: General error: 11 database disk image is malformed\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/nextcloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Auth\\\/Plugin.php(201): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Auth->check(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#1 \\\/var\\\/www\\\/html\\\/nextcloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Auth\\\/Plugin.php(150): Sabre\\\\DAV\\\\Auth\\\\Plugin->check(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 [internal function]: Sabre\\\\DAV\\\\Auth\\\\Plugin->beforeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/html\\\/nextcloud\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/html\\\/nextcloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(466): Sabre\\\\Event\\\\EventEmitter->emit('beforeMethod', Array)\\n#5 \\\/var\\\/www\\\/html\\\/nextcloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/html\\\/nextcloud\\\/apps\\\/dav\\\/lib\\\/Server.php(258): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/html\\\/nextcloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(33): OCA\\\\DAV\\\\Server->exec()\\n#8 \\\/var\\\/www\\\/html\\\/nextcloud\\\/remote.php(164): require_once('\\\/var\\\/www\\\/html\\\/n...')\\n#9 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/nextcloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/Auth.php\",\"Line\":162}","userAgent":"Mozilla\/5.0 (Macintosh) mirall\/2.3.3 (build 84) (Nextcloud)","version":"12.0.7.1"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'instanceid',
'passwordsalt' => 'password',
'secret' => 'secret',
'trusted_domains' =>
array (
0 => 'my_ip',
1 => 'my.web.addr,
),
'datadirectory' => '/data/nextcloud/data',
'overwrite.cli.url' => 'http://my_ip/nextcloud',
'dbtype' => 'sqlite3',
'version' => '12.0.7.1',
'logtimezone' => 'UTC',
'installed' => true,
'mail_from_address' => 'myemail',
'mail_smtpmode' => 'smtp',
'mail_domain' => 'gmail.com',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpsecure' => 'tls',
'mail_smtphost' => 'smtp.gmail.com',
'mail_smtpport' => '587',
'mail_smtpname' => 'myemail@gmail.com',
'mail_smtppassword' => 'mypassword',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'memcache.local' => '\\OC\\Memcache\\APCu',
);
The output of your Apache/nginx/system log in /var/log/____:
Last few lines...
[Thu Jun 07 15:44:52.703574 2018] [:error] [pid 2336] [client 71.197.180.252:56625] PHP Fatal error: Uncaught Doctrine\\DBAL\\DBALException: Failed to connect to the database: An exception occurred while executing 'PRAGMA journal_mode = WAL':\n\nSQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /var/www/html/nextcloud/lib/private/DB/Connection.php:61\nStack trace:\n#0 /var/www/html/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(992): OC\\DB\\Connection->connect()\n#1 /var/www/html/nextcloud/lib/private/DB/Connection.php(213): Doctrine\\DBAL\\Connection->executeUpdate('PRAGMA read_unc...', Array, Array)\n#2 /var/www/html/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(623): OC\\DB\\Connection->executeUpdate('PRAGMA read_unc...')\n#3 /var/www/html/nextcloud/lib/private/DB/Connection.php(148): Doctrine\\DBAL\\Connection->setTransactionIsolation(2)\n#4 /var/www/html/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(172): OC\\DB\\Connection->__construct(Array, Object(Doctrine\\DBAL\\Driver\\PDOSqlite\\Driver), Object(Doctrine\\DBAL\\Configuration), Object(Doct in /var/www/html/nextcloud/lib/private/DB/Connection.php on line 61
[Thu Jun 07 15:46:29.587516 2018] [mpm_prefork:notice] [pid 2321] AH00169: caught SIGTERM, shutting down
[Thu Jun 07 15:46:46.456224 2018] [ssl:warn] [pid 686] AH01906: 127.0.1.1:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Thu Jun 07 15:46:46.457383 2018] [ssl:warn] [pid 686] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Thu Jun 07 15:46:48.093116 2018] [ssl:warn] [pid 1113] AH01906: 127.0.1.1:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Thu Jun 07 15:46:48.093296 2018] [ssl:warn] [pid 1113] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Thu Jun 07 15:46:48.117599 2018] [mpm_prefork:notice] [pid 1113] AH00163: Apache/2.4.25 (Raspbian) OpenSSL/1.0.2l configured -- resuming normal operations
[Thu Jun 07 15:46:48.117792 2018] [core:notice] [pid 1113] AH00094: Command line: '/usr/sbin/apache2'