Internal server error after installing apcu

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Or for longer, use three backticks above and below the code snippet:


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Nextcloud version (eg, 20.0.5):`

Operating system and version (eg, Ubuntu 20.04): Debian 10

Apache or nginx version (eg, Apache 2.4.25): nginx/1.14.2

PHP version (eg, 7.4): php7.3

The issue you are facing:

I cant access my webinterface because of an internal server error after i installed php-apcu.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Install PHP7.3-apcu
  2. Add ‘memcache.local’ => ‘\OC\Memcache\APCu’, to config.php
  3. Add apc.enable_cli=1 to /etc/php/7.3/fpm/php.ini

The output of your Nextcloud log in Admin > Logging:

Not available because i cant access the webinterface. This is the output of nextcloud/data/nextcloud.log

{"reqId":"FX0w368T9YF6akmXmlaa","level":3,"time":"2021-08-27T20:05:40+00:00","remoteAddr":"%IP%","user":"--","app":"base","method":"GET","url":"/status.php","message":"Failed to start session","userAgent":"Mozilla/5.0 (Windows) mirall/3.3.1stable-Win64 (build 20210812) (Nextcloud, windows-10.0.19043 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"","exception":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"/home/administrator/nextcloud/lib/base.php","line":423,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["ocrx3jhkwm3u"]},{"file":"/home/administrator/nextcloud/lib/base.php","line":645,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"/home/administrator/nextcloud/lib/base.php","line":1083,"function":"init","class":"OC","type":"::","args":[]},{"file":"/home/administrator/nextcloud/status.php","line":37,"args":["/home/administrator/nextcloud/lib/base.php"],"function":"require_once"}],"File":"/home/administrator/nextcloud/lib/private/Session/Internal.php","Line":62,"CustomMessage":"--"}}

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

$CONFIG = array (
  'instanceid' => 'CENSORED',
  'passwordsalt' => 'CENSORED',
  'secret' => 'CENSORED',
  'trusted_domains' =>
  array (
    0 => 'MYDOMAIN',
  'datadirectory' => '/home/administrator/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' => 'MYDOMAIN',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost:3306',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nc_user',
  'dbpassword' => 'MYPASS',
  'installed' => true,
  'app_install_overwrite' => true,
  'skeletondirectory' => '/home/administrator/nextcloud/default-files',
  array (
    0 => 'twofactor_email',
    1 => 'sharingpath',
    2 => 'drop_account',
    3 => 'groupfolders',
  'updater.secret' => 'CENSORED',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'memcache.local' => '\OC\Memcache\APCu',
  'memcache.distributed' => '\OC\Memcache\Redis',
  'redis' => [
       'host'     => '',
       'port'     => '6379',

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

MYIP - user [27/Aug/2021:20:30:26 +0000] "GET /status.php HTTP/2.0" 200 1336 "-" "Mozilla/5.0 (Windows) mirall/3.3.1stable-Win64 (build 20210812) (Nextcloud, windows-10.0.19043 ClientArchitecture: x86_64 OsArchitecture: x86_64)"

the most mistake in this case is to forget to install php7.4-apcu (or depending on your system php-apcu).

just try: apt install php-apcu -y

and restart your webserver: systemctl restart apache2.service.

just to prevent the mistake even fatfinger from time to time.

*even I fatfinger from time to time.