If webui gives

... deluge nginx 502 bad gateway error

 

And

 

deluge-console gives you this error.....

deluge Failed to connect to 127.0.0.1:58846 with reason: Username does not exist

 

Try this.... 

 

sudo find / -name "auth"

Paste password from here....

sudo nano /home/vpn/.config/deluge/auth

 

To here....

sudo nano /var/lib/pam/auth