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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:
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Or for longer, use three backticks above and below the code snippet:
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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): now 27.1.6.x
Operating system and version (eg, Ubuntu 20.04): ubuntu 22.04.3
Apache or nginx version (eg, Apache 2.4.25): NGinx
PHP version (eg, 7.4): 8.2.14
The issue you are facing:
updater.phar and DB updates inkl. upgrade and apps update all went well
After integrity:check-core there are integrity hints mentioned for the “files_access_control” app as part of flow unit to let admins set special rights for file access depending on flow rules.
So it was (once more) nescessary to completely deaktivate and uninstall the app so that the apps folder is deleted as well. After re-check of the integrity:check-core the failures went away → all green
After that back to the Admin → Apps section and re-install of the files_access_control app (every time latest valid version for the actual running nextcloud (27.1.6.x in this case)
Once again control of the integrity and it stays “green” also with re-enabled files_access_control
It is less than uncomfortable to be forced every time using the updater.phar to rebuild the apps files like described.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- see above descrition
- …
- …
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
{
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"192.168.55.16",
"MY_DOMAIN"
],
"dns_pinning": true,
"activity_expire_days": 14,
"auth.bruteforce.protection.enabled": true,
"blacklisted_files": [
".htaccess",
"Thumbs.db",
"thumbs.db"
],
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"overwritehost": "MY_DOMAIN",
"overwriteconaddr": "^192\\.168\\.55\\.90$",
"overwriteprotocol": "https",
"forward_for_headers": [
"X_FORWARDED_FOR",
"HTTP_X_FORWARDED_FOR"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"overwrite.cli.url": "https:\/\/MY_DOMAIN",
"dbtype": "pgsql",
"version": "27.1.5.1",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"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": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0
},
"mail_smtpmode": "sendmail",
"mail_smtpsecure": "ssl",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "465",
"mail_smtptimeout": 10,
"mail_smtpauth": 0,
"mail_smtpauthtype": "LOGIN",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"integrity.check.disabled": false,
"updater.release.channel": "stable",
"enable_previews": true,
"preview_Movie_path": "\/usr\/bin\/ffmpeg",
"preview_ffmpeg_path": "\/usr\/bin\/ffmpeg",
"enabledPreviewProviders": [
"OC\\Preview\\PNG",
"OC\\Preview\\JPEG",
"OC\\Preview\\GIF",
"OC\\Preview\\BMP",
"OC\\Preview\\XBitmap",
"OC\\Preview\\Movie",
"OC\\Preview\\PDF",
"OC\\Preview\\MP3",
"OC\\Preview\\TXT",
"OC\\Preview\\MarkDown",
"OC\\Preview\\HEIC",
"OC\\Preview\\OpenDocument",
"OC\\Preview\\MSOffice2003",
"OC\\Preview\\MSOfficeDoc",
"OC\\Preview\\Image",
"OC\\Preview\\Photoshop",
"OC\\Preview\\SVG",
"OC\\Preview\\Font",
"OC\\Preview\\MKV",
"OC\\Preview\\MP4",
"OC\\Preview\\AVI",
"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": "FINGERPRINT",
"onlyoffice": {
"verify_peer_off": true,
"jwt_header": "Authorization",
"jwt_secret": "***REMOVED SENSITIVE VALUE***"
},
"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,
"simpleSignUpLink.shown": false,
"memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-glibc",
"memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64",
"memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
"memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
"memories.gis_type": 2,
"session_keepalive": true,
"memories.vod.disable": false,
"memories.video_default_quality": "-2"
}
