Comment 3 for bug 1015157

The ubuntu repositories contain dogtail version 0.6.1, which is geared towards gnome2.
For gnome3 compatibility, you need to manually upgrade to dogtail 0.8.0.

This is how I upgraded:
1. Remove old dogtail version by typing:
    sudo apt-get purge dogtail-python
2. Install new dependency:
    sudo apt-get install python-omniorb
3. Get the dogtail 0.8.0 tarball from https://fedorahosted.org/released/dogtail/ and expand it in a temporary directory.
4. Change to the directory where you expanded the tarball and run the install script:
    sudo python ./setup.py install --prefix=/usr/local