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The Basics
Nextcloud Server version (e.g., 29.x.x):32.0.1.2
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Operating system and version (e.g., Ubuntu 24.04):Debian 12
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Web server and version (e.g, Apache 2.4.25):2.4.66 Debian
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PHP version (e.g, 8.3): PHP8.2
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Is this the first time you’ve seen this error? (Yes / No):YEs
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When did this problem seem to first start?no
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Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.) do remember think webinstaller
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Are you using CloudfIare, mod_security, or similar? (Yes / No)
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Summary of the issue you are facing:
somthing messed my permissions to web root
no I get
Error
Your data directory is invalid.
Ensure there is a file called “.ncdata” in the root of the data directory. It should have the content: “# Nextcloud data directory”
Was it the process for restoring described in the Admin Manual?
The most common I see this happening is when someone does a move or copy * operation between folders on the host. That won’t include dot files such as .ncdata.
I manage my Servers, Sites, etc. with ISPconfig
I changed the client of my Nextcloud instance, after that the problem startet
That change results in “If you change the owner of a site by updating that site’s client setting, its group changes. If your nextcloud does not work afterwards, then you must fix the group ownership of your nextcloud files.”
I am asking for a hint, how to set the correct permission from the command line.
I have root access via SSH to the server.
I don’t use ISPConfig or any other web hosting panel myself, but I do know that they often don’t use the standard paths and usernames of the underlying operating system. Instead, they typically use their own users, groups, and directory structures. In that case, you’ll need to adjust the command accordingly.
For example, on a standard Debian setup with Apache, the command for setting the ownership would look something like this:
chown -R www-data:www-data /var/www/nextcloud
In your case, however, based on the last reply you received in the above-linked forum thread, it would probably be:
Ok fixed now, the reason for the failure was the config.php had the old datapath
GROK gave me the essentional hint
thanks anybody for help
best regards
rainer
Before pasting the above command, double-check that the user, group, and path are actually correct!