Diagnose "the update was not succesful"

After updating I run the /utility/update and get:
Failure
The update was not successful.
How do I diagnose this? Find out what is wrong? The forum SEEMS to work fine.
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After updating I run the /utility/update and get:
Failure
The update was not successful.
How do I diagnose this? Find out what is wrong? The forum SEEMS to work fine.