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Error code 0X80131604 when applying CU 19 to SQL 2017 RTM

rwheeler23 asked
I am trying to apply CU 19 to an instance of SQL 2017 RTM Standard and I am getting this error code: 0X80131604.

When I look at the log file it is huge and I do not see this error code. How do I find what is preventing this update?
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Database Analyst
When you say the log file is huge it means in my opinion that you may not be looking at the Log file for that CU install where you should find the reason why it failed and that file should be under the "bootstrap" folder in a location like: C:\Program Files\Microsoft SQL Server\xxx\Setup Bootstrap\Log\ where xxx would be your SQL version - 140 in your case