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Ubuntu uses ~/.profile. you can create your .bash_profile in ubunut but then .profile would not be read.
#cat ~/.profile
output
====================
# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.
............
..............
.............

====================

hope that helped