Update impossible

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1
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Nextcloud version (eg, 18.0.2): 19.04
Operating system and version (eg, Ubuntu 20.04): Raspbian GNU/Linux 10 (buster) armv7lRaspbian GNU/Linux 10 (buster) armv7l
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 (Raspbian)
PHP version (eg, 7.1):

The issue you are facing: The administration panel tells me :
Nextcloud Pi 19.0.4

Une nouvelle version est disponible : Nextcloud 19.0.6
Toutes les applications ont une mise à jour disponible pour cette version

But when I open the updater I get :
Initializing
Current version is 19.0.4.
No update available.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

The output of your Nextcloud log in Admin > Logging:

Initializing
Current version is 19.0.4.
No update available.

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

Error: unlink(/var/www/nextcloud/data/appdata_ocbvme02ofr8/css/core/4ddd-a312-css-variables.css): No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#283

The output of your Apache/nginx/system log in /var/log/____:

PASTE HERE
2

Try updating ncp first by running

sudo ncp-update

Not enough info here, run ncp-report, share via pastebin service, if want support.

3

ncp is not installed on my instance. I did the nextcloud installation
from scratch on a newly installed raspbian.

I had ncp on a previous installation, but it did not match my needs :
boot from hard disk not properly handed leading to lot of warning about
usb disks, poor language support, and overrides my own security rules
(jail, ip banish …)

4

Then maybe you can remove the ncp tag from your thread?

5

I sat the referring tag because of this.

And because of that I just removed it again

So you see how important correct informations are… And that there ARE informations at all.