Hi All,
New this community, I’m running Nextcloud on a Raspberry Pi 4 (w/o Docker) with external storage. Things appeared to be working but that is degrading quickly. I’m not an IT or Linux expert by any means, so I may need some hand-holding.
I created an empty .ncdata file at the root or my data directory
I’m trying to resolve these recent error messages:
performing a “sudo chmod -R 777 /mnt/ produces this error
performing a “sudo chmod -R 770 /mnt/ produces this error
Hello @saycoda,
welcome to the Nextcloud community! 
please use search the topic is discussed many times already. basically the right commands are
#chown -R www-data:www-data ./files
find ./app ./config ./data -type d -exec sudo chown -R www-data:www-data '{}' \;
find ./app ./config ./data -type d -exec sudo chmod 750 '{}' \;
find ./app ./config ./data -type f -exec sudo chmod 640 '{}' \;
where www-data is the user running your webserver and app, config and data are directories used for respective data.
As you are missing basic knowledge I recommend to review 101: Self-hosting information for beginners