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cortho · November 25, 2019, 11:18am

Hi,

when I entered “Parent of share should be unique” into google I received the following results:

github.com/owncloud/core

Update error when duplicate sub-shares exist

opened 03:12AM - 24 May 17 UTC

closed 10:13AM - 03 Apr 18 UTC

lukovas

Type:Bug feature:sharing p2-high

There was an error updating. Please, help! OC\Share20\Exception\ProviderExcep…tion: Parent of share should be unique Detailed logs: Preparing update Set log level to debug Turned on maintenance mode Updating database schema Updated database Updated "activity" to 2.3.4 [1 / 28]: Drop old database table: calendar_calendars [2 / 28]: Drop old database table: calendar_objects [3 / 28]: Drop old database table: calendar_share_calendar [4 / 28]: Drop old database table: calendar_share_event [5 / 28]: Drop old database table: file_map [6 / 28]: Drop old database table: foldersize [7 / 28]: Drop old database table: fscache [8 / 28]: Drop old database table: gallery_sharing [9 / 28]: Drop old database table: locks [10 / 28]: Drop old database table: log [11 / 28]: Drop old database table: media_albums [12 / 28]: Drop old database table: media_artists [13 / 28]: Drop old database table: media_sessions [14 / 28]: Drop old database table: media_songs [15 / 28]: Drop old database table: media_users [16 / 28]: Drop old database table: permissions [17 / 28]: Drop old database table: pictures_images_cache [18 / 28]: Drop old database table: principalgroups [19 / 28]: Drop old database table: principals [20 / 28]: Drop old database table: queuedtasks [21 / 28]: Drop old database table: sharing [22 / 28]: Drop old database table: clndr_calendars [23 / 28]: Drop old database table: clndr_objects [24 / 28]: Drop old database table: clndr_share_event [25 / 28]: Drop old database table: clndr_share_calendar [26 / 28]: Drop old database table: clndr_repeat [27 / 28]: Drop old database table: contacts_addressbooks [28 / 28]: Drop old database table: contacts_cards [28 / 28]: Drop old database tables [1 / 4]: Remove old (< 9.0) calendar/contact shares [2 / 4]: Remove old (< 9.0) calendar/contact shares [3 / 4]: Remove old (< 9.0) calendar/contact shares [4 / 4]: Remove old (< 9.0) calendar/contact shares [4 / 4]: Remove old (< 9.0) calendar/contact shares [1 / 2]: Fix permissions so avatars can be stored again [1 / 1]: Fix permissions so avatars can be stored again [1 / 44]: Move user avatars outside the homes to the new location [2 / 44]: Move user avatars outside the homes to the new location [3 / 44]: Move user avatars outside the homes to the new location OC\Share20\Exception\ProviderException: Parent of share should be unique

So as a wild guess I’d try occ files:clean first.
Then look for duplicates as described in the second link.

In general I’d recommend to upgrade your ownCloud to the latest version and, when more than 5000 users are depending on your ownCloud, you might want to consider an enterprise subscription with support.