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Hello,
I could suggest the following:
sudo -i -u ghost-mgr to switch to the Ghost usercd /var/www/ghostghost doctor commandFeel free to share the output of the command here.
Also make sure to check your Nginx error log to see the actual error rather than the generic 502 error:
tail -100 /var/log/nginx/error.log
Let me know how it goes.
Best,
Bobby