[SOLVED] Internal Error after upgrade NC13 to NC14

Hi, I start an update from the web interface. Trying to update from NC 13 to NC 14. Everything seems to went fine. But I try to finish the update by the web interface it show me : Interna Server Error and some more general sentences.

What should I do?

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Nextcloud version (eg, 12.0.2): origanally 13 trying to update to 14
Operating system and version (eg, Ubuntu 17.04): Raspberry-Pi
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.25
PHP version (eg, 7.1): 1:7.0

The issue you are facing:
After updating from the web interface, I can’t connect to NC from the web to end the update.

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

Steps to replicate it:

  1. try to log from web interface and get the same error

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

<?php
$CONFIG = array (
  'instanceid' => 'xxxxx',
  'passwordsalt' => 'xxxxx',
  'secret' => 'xxxxx',
  'trusted_domains' =>
  array (
    0 => 'nextcloud-xxxxx',
  ),
  'datadirectory' => '/var/www/data',
  'overwrite.cli.url' => 'https://nextcloudxxxxx',
  'dbtype' => 'mysql',
  'version' => '13.0.6.1',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xxxxx',
  'dbpassword' => 'xxxxx',
  'installed' => true,
  'logtimezone' => 'Europe/Paris',
  'logfile' => '/var/www/data/nextcloud.log',
  'loglevel' => 2,
  'log_authfailip' => true,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'auth.bruteforce.protection.enabled' => true,
  'maintenance' => false,
  'theme' => '',
  'updater.secret' => 'xxxxx',
);
config.php (END)

/var/log/apache2/error.log (less | tail) :
[Mon Dec 24 12:44:16.834500 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:17.118863 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:17.934554 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:18.213397 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:18.495143 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:19.231325 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:20.070738 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:20.358553 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:20.637946 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'
[Mon Dec 24 12:44:22.122340 2018] [proxy_fcgi:error] [pid 6022] [client 118.89.38.35:40182] AH01071: Got error 'Primary script unknown\n'

nextcloud.log (las entry) : 
{"reqId":"Rvg572iCxiQOlhXHaiLf","level":3,"time":"2018-12-24T13:06:06+01:00","remoteAddr":"192.168.0.254","user":"--","app":"PHP","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"You are using a fallback implementation of the intl extension. Installing the native one is highly recommended instead. at \/var\/www\/nextcloud\/3rdparty\/patchwork\/utf8\/src\/Patchwork\/Utf8\/Bootup\/intl.php#18","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.3.3 (Nextcloud)","version":"13.0.6.1"}
 
Thanks

Hi, I answer to myself.
Seems I found a solution with this post :
https://help.nextcloud.com/t/internal-server-error-after-upgrade-to-nextcloud-13/28127/6

I added the line :
'debug' => true,

So I can carry on the upgrade with the web interface.
But one warning occurs :

The following app has been deactivated : files_reader (not compatible)

Why that happen?
Is this a critical issue?
How to fix this files_reader bug?

Thanks,

In this post there is a link to the related github issue:

Thanks. Done. I mark it solved.