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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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
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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): 27.0
Operating system and version (eg, Ubuntu 20.04): latest Docker image
Apache or nginx version (eg, Apache 2.4.25): 2.4.56
PHP version (eg, 7.4): 8.2.7
The issue you are facing:
Cannot reach nextcloud anymore. After starting the docker container I am told to perform an upgrade. The upgrade fails with LDAP Operations error.
Is this the first time you’ve seen this error? (Y/N): yes
Steps to replicate it:
- Upgrade to latest docker image (27.0)
The output of your Nextcloud log in Admin > Logging:
not reachable anymore
The detailed output I get is:
Exception: Database error when running migration 1027Date20230504122946 for app dav LDAP Operations error
Detaillierte Protokollmeldungen
Update vorbereiten
Log-Level auf “debug” gesetzt
Wartungsmodus eingeschaltet
Reparaturschritt: Repair MySQL collation
Reparaturinformation: All tables already have the correct collation → nothing to do
Reparaturschritt: Repair SQLite autoincrement
Reparaturschritt: Copy data from accounts table when migrating from ownCloud
Reparaturschritt: Drop account terms table when migrating from ownCloud
Das Datenbankschema wird aktualisiert
Datenbank aktualisiert
Exception: Database error when running migration 1027Date20230504122946 for app dav LDAP Operations error
Das Update ist fehlgeschlagen. Bitte melden Sie dieses Problem an die Nextcloud Community.
What could I do?
Thank you for your help!
Best regards,
Monty