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+updates:
+https://help.nextcloud.com/t/updates-between-multiple-major-versions-are-unsupported/7094
+Solution:
+You need to upgrade first to the latest available version of 10.0.x which is currently 10.0.2. For that specific scenario the following is recommended:
+
+Remove all files and folders of your Nextcloud installation folder except /data/ and /config/
+Download 9.0.56 from https://nextcloud.com/changelog/ 3.0k
+Extract the content of the archive it into your Nextcloud installation folder
+Run the update via the webui or the command line tool
+Afterwards repeat those steps with 10.0.2 and 11.0.0
+
+
+
+docker exec -u www-data nextcloud php occ ...
+docker exec -u 0 nextcloud php occ
+docker exec -u 0 nextcloud php occ maintenance:mode --on
+docker exec -u 0 nextcloud php occ upgrade
+    occ files:scan --all
+    occ maintenance:mode --on
+    docker exec -u www-data nextcloud php occ upgrade
+
+
+    To check the database version in Nextcloud:
+docker exec -u www-data nextcloud php occ config:system:get version
+
+
+27.0.2.1 ->> 28.0.14 -> 29.0.10 -> 30.0.4
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