[user@bitcoin .bitcoin]$ find Bitcoin-Qt.conf
find: 'Bitcoin-Qt.conf': No such file or directory
[user@bitcoin .bitcoin]$ sudo find /var/lib/bitcoin/Bitcoin-Qt.conf
find: '/var/lib/bitcoin/Bitcoin-Qt.conf': No such file or directory
[user@bitcoin .bitcoin]$ sudo find /etc/bitcoin/Bitcoin-Qt.conf
find: '/etc/bitcoin/Bitcoin-Qt.conf': No such file or directory
So apparently it's not in any of those locations... unless running find as root works as well as the other commands I've tried to use involving the system directories
Edit: found it...
As you maybe already noticed the syntax of find command was incorrect. Should be something like
find / -name Bitcoin-Qt.conf -print