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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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 (eg, 20.0.5): 27.1.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.4): 8.1
The issue you are facing:
Recieved message in Administration Settings area that 27.1.3 is available. When I click on the “Open Updater” button, the page refreshes and says, “Page Not Found - The page could not be found on the server or you may not be allowed to view it.” I have no “updater” folder in my var/www/html (nextcloud) folder. I’m not certain whether I accidently deleted at some point. Is it possible to restore the folder and contents to automate my updates? This instance of Nextcloud is a NON-docker install on a LAMP Ubuntu.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- See narrative
The output of your Nextcloud log in Admin > Logging:
No errors related to this problem in log file
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
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