Google drive option won't show up in my File Manager
You could mount the remote location with gio
$ gio mount google-drive://<your gmail user>@gmail.com/
Please report what you get, both when mounting and then in Nautilus (make sure the file manager you are using is Nautilus!).
Also post the output of
$ gio mount -l
As of now, I wouldn't know the reason why it does not show.
EDIT: You might be missing package gvfs-backends.