Could you try the following and tell us if this is working for you ? Check that git-review's directory is properly setup in your PATH environment variable...

# OS-installed one
$ which git-review
/usr/bin/git-review
$ git review --version
git-review version 1.23
$ dpkg-query -L git-review | grep 'bin/git-review'
/usr/bin/git-review

$ git clone https://git.openstack.org/cgit/openstack-infra/git-review
$ cd git-review
$ python setup.py install --user
$ export PATH=$HOME/.local/bin:$PATH

# New one from upstream source repository
$ which git-review 
/home/myself/.local/bin/git-review
$ git review --version
git-review version 1.25.0.8.g44707a1

Alternatively you can use pip to install git-review:

$ pip install git-review

Or, if you are not administrator:

$ pip install --user git-review