Ubuntu does not normally have a .bash_profile

You should add your change to the end of .profile instead, since this file will not be read if .bash_profile exists, and Ubuntu normally has code in .profile to at least source .bashrc in login shells, so we want it to be read!

I recommend you don't create any new files, but modify the existing .profile (found in your home directory, but hidden as it starts with a .) instead to add to your PATH. This is an appropriate and usual way of modifying your environment in Ubuntu