No its a dedicated server only for me
I did manual installation!!
okay, good to know 
Okay. Did you use a tutorial for this? Could you post a link to it here?
I think this one https://www.google.com/amp/s/www.linuxbabe.com/ubuntu/install-nextcloud-ubuntu-18-04-nginx-lemp/amp
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Thank you!
Now we only need one additional info:
What is the output of
sudo ls -la /home
?
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Thanks!
So finally those commands should make it work:
sudo chown -R www-data:www-data /home
sudo chmod -R 770 /home
Omg, can’t thank you enough!!! Thank you a lot, keep helping noobs like me :)))))
You are welcome! Unfortunately I am not able to help with this other issue since I am not confident with Pyocclient.
Understood, Thanks Man 
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But can you see the second error? It says files_trashbin/files is not writable… What should I do?
This should most likely be resolveable by executing:
sudo chown -R www-data:www-data /usr/share/nginx/nextcloud-data
sudo chmod -R 770 /usr/share/nginx/nextcloud-data
It shows these errors! 
Okay, then this should resolve your issue:
sudo chown -R www-data:www-data /var/www/nextcloud
sudo chmod -R 770 /var/www/nextcloud
OMG, that solved the problem!!! Thank you a lot, you are genius man <3
But I do want to know, what actually happened? The problem?
It seems like the unix permissions were set incorrectly. I don’t know why.
Thanks I don’t know how it happened