Web Reference: Apr 8, 2025 · This article helps you troubleshoot error 15151 that occurs when you install a cumulative update (CU) or service pack (SP) for Microsoft SQL Server. The error occurs when database upgrade scripts are run. Oct 2, 2019 · You can create a login based on a Windows principal (such as a domain user or a Windows domain group) or you can create a login that is not based on a Windows principal (such as an SQL Server login). Nov 30, 2011 · The error suggests that the User "dbuser" does not exist in the master database. I assume the user exists within the master database? You can check by using the following T-SQL
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