I don't think this bug is still valid since there is no need for a parent button in the latest version of Nautilus in Ubuntu 13.04 since there are buttons for every directory upwards of the current directory that you're in at the moment. See screenshot.
I don't think this bug is still valid since there is no need for a parent button in the latest version of Nautilus in Ubuntu 13.04 since there are buttons for every directory upwards of the current directory that you're in at the moment. See screenshot.