Comment 1 for bug 1243044

The line of code where this exception is originating is https://git.openstack.org/cgit/openstack-infra/git-review/tree/git-review?id=1.23#n179 which is saying that you have a /etc/git-review/git-review.conf file with no "updates" section. Normally git-review shouldn't need a global configuration file (not sure how you wound up with one--maybe installing an older distribution package and then using pip to install a newer git-review?). You can try removing or correcting that file, but you might want to make sure that you uninstall and purge any old git-review you may have installed using apt-get as well.