Error messages: "QMYSQL: Unable to execute query" "Error on rename of './tdn_digikam/Albums' to './tdn_digikam/#sql2-1b98-73' (errno: 152)" 1025 2 
Bound values:  ()
digikam.dbengine: Error while executing DBAction [ "UpdateSchemaFromV7ToV8" ] Statement [ "ALTER TABLE Albums\n                                        DROP FOREIGN KEY Albums_AlbumRoots;" ]
digikam.coredb: Core database: schema update to V 8 failed!
digikam.coredb: Core database: cannot process schema initialization