Steffen Bendix wrote:

> Lew Pitcher  wrote:
>
>> This would likely entail
>> shutting down and restarting your web server. That should be all you need
>> to do.
>
> I even restarted the Pi but it did not help.

OK, then the only other advice I can give you is to check out the Nextcloud
installation instructions at
  https://docs.nextcloud.com/server/13/admin_manual/installation/index.html
and make sure that all the appropriate requirements, dependancies, and
configurations are met.

Sorry
--
Lew Pitcher
"In Skills, We Trust"
PGP public key available upon request

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