Support intro
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 (eg, 20.0.5): 26.0.1
Operating system and version (eg, Ubuntu 20.04): docker.io/nextcloud
Apache or nginx version (eg, Apache 2.4.25): n.a.
PHP version (eg, 7.4): n.a.
The issue you are facing:
I’m trying to update to 26.0.2 and when I click the ‘Open Updater’ button in the Admin → Overview, I get a 404 error
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
Not sure exactly how to replicate this so I’ll just tell you what I have done.
The app has been installed and working for a while now but it was slow so I added a redis container and linked it to the nextcloud container via a docker network.
Once I got it up and running again, I tried to run the update but the link just gives me a 404 error.
I am thinking that since it is docker, I can just docker pull the latest container (26.0.2 in this case), but I’m concerned because I have been able to update the installation using the updater before now.
What I did instead was update my compose file to use nextcloud:26.0.1 instead … just in case I was missing files, it would pull the image again.
That didn’t work and the only thing that happened since the last time I updated was that a file system got filled.
Any ideas?
The output of your Nextcloud log in Admin > Logging:
{"reqId":"3Vp0NVy6q608nJQtigyt","level":0,"time":"2023-06-06T04:47:19+00:00","remoteAddr":"172.25.0.1","user":"camille","app":"logreader","method":"GET","url":"/index.php/settings/admin/logging","message":"Could not find resource file \"/apps/logreader/css/../js/logreader-main.css\"","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/113.0","version":"26.0.1.1","data":{"app":"logreader"},"id":"647eba598b7f3"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!): PrivateBin
The output of your Apache/nginx/system log in /var/log/____: PrivateBin
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. PrivateBin
