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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, 20.0.5): 27.0.1
Operating system and version (eg, Ubuntu 20.04): ubuntu-server 22.04
Apache or nginx version (eg, Apache 2.4.25): NGinx
PHP version (eg, 7.4): 8.2
The issue you are facing:
After Upgrade 26.0.3 to 26.0.4 everything was ok so far.
NC offered me to further upgrade to 27.0.1 after this - trouble began.
WebDAV (Client Apps) were running, redis and notify_push (HPB) were reachable and running.
WebUI (NGinx) said “Internal server error …” (no Login Screen)
Error log of nextcloud does not give hints to me…
Is this the first time you’ve seen this error? (Y/N): y
Steps to replicate it:
- have files_fulltextsearch (version 27.0.0) installed and active next to elasticsearch
- update a NC 26.x.x to 27.x.x
- see what happened to your WebUI ( Logon Screen)
- temporarily disable files_fulltextsearch by occ app:xxxxx commands
- occ maintenance:repair
- re-install and enable files_fulltextsearch again
- see that your NC WebUI again reports “Internal Server error …”
The output of your Nextcloud log in Admin > Logging:
see 2nd post ...
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ID',
'passwordsalt' => 'pass',
'secret' => 'my_secret',
'trusted_domains' =>
array (
0 => 'LOCAL-IP-OF-NC-VM',
1 => 'FQDN',
),
'activity_expire_days' => 14,
'auth.bruteforce.protection.enabled' => true,
'blacklisted_files' =>
array (
0 => '.htaccess',
1 => 'Thumbs.db',
2 => 'thumbs.db',
),
'trusted_proxies' =>
array (
0 => 'IP-OF-REVERSE-PROXY',
),
'overwritehost' => 'FQDN',
'overwriteconaddr' => '^IP-OF-REVERSE-PROXY$',
'overwriteprotocol' => 'https',
'forward_for_headers' =>
array (
0 => 'X_FORWARDED_FOR',
1 => 'HTTP_X_FORWARDED_FOR',
),
'datadirectory' => '/media/cloud/data',
'overwrite.cli.url' => 'https://domain',
'dbtype' => 'pgsql',
'version' => '27.0.1.2',
'dbname' => 'DB_NAME',
'dbhost' => '/run/postgresql',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'DB_USER',
'dbpassword' => '',
'htaccess.RewriteBase' => '/',
'logtimezone' => 'Europe/Berlin',
'default_phone_region' => 'DE',
'logfile' => '/media/cloud/data/nextcloud.log',
'log_rotate_size' => 10485760,
'cron_log' => true,
'installed' => true,
'filesystem_check_changes' => 0,
'quota_include_external_storage' => false,
'skeletondirectory' => '',
'share_folder' => '/Freigaben',
'knowledgebaseenabled' => false,
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
'ldapUserCleanupInterval' => 20,
'bulkupload.enabled' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => 'true',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => 0,
'dbindex' => 0,
'timeout' => 1.5,
),
'mail_smtpmode' => 'sendmail',
'mail_smtpsecure' => 'ssl',
'mail_from_address' => 'sender',
'mail_domain' => 'domain',
'mail_smtphost' => 'smtp_host',
'mail_smtpport' => '465',
'mail_smtptimeout' => 10,
'mail_smtpauth' => 0,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpname' => '',
'mail_smtppassword' => '',
'maintenance' => false,
'integrity.check.disabled' => false,
'updater.release.channel' => 'stable',
'enable_previews' => true,
'preview_Movie_path' => '/usr/bin/ffmpeg',
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\BMP',
4 => 'OC\\Preview\\XBitmap',
5 => 'OC\\Preview\\Movie',
6 => 'OC\\Preview\\PDF',
7 => 'OC\\Preview\\MP3',
8 => 'OC\\Preview\\TXT',
9 => 'OC\\Preview\\MarkDown',
10 => 'OC\\Preview\\HEIC',
11 => 'OC\\Preview\\OpenDocument',
12 => 'OC\\Preview\\MSOffice2003',
13 => 'OC\\Preview\\MSOfficeDoc',
14 => 'OC\\Preview\\Image',
15 => 'OC\\Preview\\Photoshop',
16 => 'OC\\Preview\\SVG',
17 => 'OC\\Preview\\Font',
18 => 'OC\\Preview\\MKV',
19 => 'OC\\Preview\\MP4',
20 => 'OC\\Preview\\AVI',
21 => 'OC\\Preview\\Movie',
22 => 'OC\\Preview\\TIFF',
),
'preview_max_x' => 2048,
'preview_max_y' => 2048,
'preview_max_memory' => 4096,
'preview_max_filesize_image' => 256,
'preview_max_scale_factor' => 1,
'trashbin_retention_obligation' => 'auto, 2',
'loglevel' => 3,
'mail_sendmailmode' => 'smtp',
'data-fingerprint' => 'my_fingerprint',
'onlyoffice' =>
array (
'verify_peer_off' => true,
'jwt_header' => 'Authorization',
'jwt_secret' => 'my_pass',
),
'encryption.legacy_format_support' => false,
'encryption.key_storage_migrated' => false,
'defaultapp' => 'dashboard',
'theme' => '',
'allow_local_remote_servers' => true,
'files_external_allow_create_new_local' => true,
'app_install_overwrite' =>
array (
0 => 'fulltextsearch',
1 => 'fulltextsearch_elasticsearch',
2 => 'files_fulltextsearch',
3 => 'theming_customcss',
),
'memories.exiftool' => '/var/www/nextcloud/apps/memories/exiftool-bin/exiftool-amd64-glibc',
'memories.vod.path' => '/var/www/nextcloud/apps/memories/exiftool-bin/go-vod-amd64',
'memories.vod.ffmpeg' => '/usr/bin/ffmpeg',
'memories.vod.ffprobe' => '/usr/bin/ffprobe',
'memories.gis_type' => 2,
'memories.vod.vaapi' => true,
'memories.exiftool_no_local' => true,
);
It is reproducable that the files_fulltextsearch app in version 27.0.0 (latest stable i think) damages my NC instance so that the WebUI is unusable any longer. All other services (webdav, notify_push, etc.) remains working!!
I have another app that has been disabled during upgrade because auf incompatible version for the moment - "Activities for shared file downloads - but i think that’s not the game changer here.
This app remains disabled until another update will make it compatible with NC 27 again.
First think was that the groupfolders app could have something to do with the “Internal server error…” but this seems not to be the fact.
I re-enabled it and all is working incl. WebUI
Any ideas what goes on with the files_fulltextsearch app? or the combination?