Upgrade to 18.0.3 fails and stays in maintenance mode

Can you run the occ command from command line? You have a lot of apps, perhaps the whole process takes too long. If that does not help, I’d try to disable a few apps, you have a lot of them. In this case, it updates the core first and then you can enable the apps later one by one. In case one apps causes the problem you know which one it was.

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