Um, there is no "uninstall" program in Linux and removing a program is generally done with a package manager. But it depends on how you installed it.
I'm assuming you've installed "standalone" Confluence, which is a matter of
If you're struggling to delete the installation directory, then you need to investigate that - read the error message it gives you and fix that problem first.
Assuming you're using Nautilus as your file manager here, you'll find the lock means "you don't have permission to do this". I'd guess you've installed confluence under a different user id - you'll need to swap to that user or change permissions on the folder using a process with root access.
Forgetting where your data directory, we can't help you with - you'll need to find it (look in your home folder, or that of the user you installed it as, to begin with). If confluence was running, you could just look in system info, but if you've dropped the database, I don't think it'll start up.
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