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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version _ 30.0.1
Operating system and version _ Ubuntu 22.04.5 LTS
Apache or nginx version _ Apache/2.4.52 (Ubuntu)
PHP version _ PHP 8.1.2-1ubuntu2.19 (cli) (built: Sep 30 2024 16:25:25)
Zend Engine v4.1.2, Copyright (c) Zend Technologies with Zend OPcache v8.1.2-1ubuntu2.19
The issue you are facing:
Receiving this error message when attempting to update to version 30.0.2
Is this the first time you’ve seen this error? _ Y
Steps to replicate it:
- Open updater
- Start update
- Cannot move past “Check for expected files”
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE