Comments - Error on delete of .\tmp\mariadb\#sql3c1c_45_31.MAI (Errcode: 13 “Permission denied”)
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I can only suggest looking more carefully at the permissions. You mention that 'temp' has permissions, but the error is on 'tmp'. Also, there is no MariaDB 8.0.18. There is a MySQL 8.0.18 however.