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(Utilizing these existing resources is typically faster. It also helps reduce the load on our generous volunteers while elevating the signal to noise ratio of the forums otherwise arising from the same queries being posted repeatedly).
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. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
32
- Operating system and version (e.g., Ubuntu 24.04):
debian 12.14
- Web server and version (e.g, Apache 2.4.25):
- nginx/1.22.
- Reverse proxy and version _(e.g. nginx 1.27.2)
- nginx/1.22.
- PHP version (e.g, 8.3):
- 8.2.31
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
while upgrade to 33
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
GUI
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
no
Summary of the issue you are facing:
sudo -E -u www-data php occ upgrade -vvv
July 01, 2026 18:46:34 Setting log level to debug
July 01, 2026 18:46:34 Repair step: Repair MySQL collation
July 01, 2026 18:46:34 Repair info: All tables already have the correct collation → nothing to do
July 01, 2026 18:46:34 Repair step: Copy data from accounts table when migrating from ownCloud
July 01, 2026 18:46:35 Repair step: Drop account terms table when migrating from ownCloud
July 01, 2026 18:46:35 Updating database schema
July 01, 2026 18:46:35 Exception: Database error when running migration 33000Date20251023120529 for app core
An index with name “unique_bucket_store” was already defined on table “oc_preview_locations”.
July 01, 2026 18:46:35 Update failed
July 01, 2026 18:46:35 Maintenance mode is kept active
Steps to replicate it (hint: details matter!):
-
try upgrade via console or GUI
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
PASTE HEREutf8mb4
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
Firefox
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
preformatted{
“system”: {
“instanceid”: “***REMOVED SENSITIVE VALUE***”,
“passwordsalt”: “***REMOVED SENSITIVE VALUE***”,
“datadirectory”: “***REMOVED SENSITIVE VALUE***”,
“dbtype”: “mysql”,
“version”: “32.0.12.1”,
“dbname”: “***REMOVED SENSITIVE VALUE***”,
“dbhost”: “***REMOVED SENSITIVE VALUE***”,
“dbtableprefix”: “oc_”,
“dbuser”: “***REMOVED SENSITIVE VALUE***”,
“dbpassword”: “***REMOVED SENSITIVE VALUE***”,
“installed”: true,
“forcessl”: true,
“theme”: “”,
“maintenance”: false,
“trusted_domains”: [
“***REMOVED SENSITIVE VALUE***”,
“***REMOVED SENSITIVE VALUE***”,
“***REMOVED SENSITIVE VALUE***”,
“***REMOVED SENSITIVE VALUE***”
],
“log_type”: “file”,
“logfile”: “\/var\/log\/nextcloud.log”,
“loglevel”: 0,
“logdateformat”: “F d, Y H:i:s”,
“secret”: “***REMOVED SENSITIVE VALUE***”,
“trashbin_retention_obligation”: “auto”,
“mail_from_address”: “***REMOVED SENSITIVE VALUE***”,
“mail_smtpmode”: “smtp”,
“mail_domain”: “***REMOVED SENSITIVE VALUE***”,
“overwrite.cli.url”: “***REMOVED SENSITIVE VALUE***”,
“mail_smtpsecure”: “tls”,
“mail_sendmailmode”: “smtp”,
“mail_smtphost”: “***REMOVED SENSITIVE VALUE***”,
“mail_smtpport”: “587”,
“mail_smtpauthtype”: “PLAIN”,
“mail_smtpauth”: 1,
“mail_smtpname”: “***REMOVED SENSITIVE VALUE***”,
“mail_smtppassword”: “***REMOVED SENSITIVE VALUE***”,
“music.lastfm_api_key”: “***REMOVED SENSITIVE VALUE***”,
“app_install_overwrite”: [
“hancomoffice”,
“ransomware_detection”,
“snappymail”
],
“mysql.utf8mb4”: true,
“defaultapp”: “snappymail,dashboard,files”,
“updater.secret”: “***REMOVED SENSITIVE VALUE***”,
“files.chunked_upload.max_size”: 20971520,
“trusted_proxies”: “***REMOVED SENSITIVE VALUE***”,
“default_phone_region”: “DE”,
“memcache.local”: “\\OC\\Memcache\\APCu”,
“filelocking.enabled”: “true”,
“memcache.locking”: “\\OC\\Memcache\\Redis”,
“redis”: {
“host”: “***REMOVED SENSITIVE VALUE***”,
“port”: 6379,
“timeout”: 0
}
}
}
Apps
The output of occ app:list (if possible).
- Enabled:
- activity: 5.0.0
- app_api: 32.0.0
- audioplayer: 3.9.0
- bruteforcesettings: 5.0.0
- calendar: 6.5.0
- circles: 32.0.0
- cloud_federation_api: 1.16.0
- comments: 1.22.0
- contacts: 8.3.14
- dashboard: 7.12.0
- dav: 1.34.2
- encryption: 2.20.0
- federatedfilesharing: 1.22.0
- federation: 1.22.0
- files: 2.4.0
- files_downloadlimit: 5.0.0
- files_notify_redis: 0.3.8
- files_pdfviewer: 5.0.0
- files_reminders: 1.5.0
- files_sharing: 1.24.1
- files_trashbin: 1.22.0
- files_versions: 1.25.0
- firstrunwizard: 5.0.0
- logreader: 5.0.0
- lookup_server_connector: 1.20.0
- mail: 5.10.5
- music: 3.1.0
- nextcloud_announcements: 4.0.0
- notifications: 5.0.0
- notify_push: 1.3.3
- oauth2: 1.20.0
- passwords: 2026.6.10
- photos: 5.0.0
- polls: 9.1.4
- privacy: 4.0.0
- profile: 1.1.0
- provisioning_api: 1.22.0
- qownnotesapi: 26.5.0
- recommendations: 5.0.0
- related_resources: 3.0.0
- serverinfo: 4.0.0
- settings: 1.15.1
- sharebymail: 1.22.0
- support: 4.0.0
- survey_client: 4.0.0
- systemtags: 1.22.0
- theming: 2.7.0
- twofactor_backupcodes: 1.21.0
- twofactor_totp: 14.0.0
- updatenotification: 1.22.0
- user_status: 1.12.0
- viewer: 5.0.0
- webhook_listeners: 1.3.0
- workflowengine: 2.14.0
Disabled: - admin_audit: 1.23.0
- contactsinteraction: 1.14.1 (installed 1.1.0)
- files_external: 1.25.1
- password_policy: 5.0.0 (installed 4.0.0)
- suspicious_login: 11.0.0
- text: 7.0.1 (installed 3.4.0)
- twofactor_nextcloud_notification: 7.0.0
- user_ldap: 1.24.0
- weather_status: 1.13.0 (installed 1.0.0
Tips for increasing the likelihood of a response
- Use the
preformatted textformatting option in the editor for all log entries and configuration output. - If screenshots are useful, feel free to include them.
- If possible, also include key error output in text form so it can be searched for.
- Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.