pyserial not installed properly for python3

On Ubuntu Quantal 12.10, when running with the provided pyserial python package, calling "serial" produces an error message:
File "/usr/share/pyshared/serialposix.py", line 64
    50: 0000001,
                   ^
SyntaxError: invalid token

This is because pyserial has been installed (by/for the package) by doing "python setup.py install" instead of "python3 setup.py install". A manual installation of pyserial, properly installing it with python3 solves the problem.

Moreover, python packages installed in "/usr/share/pyshared" are not recognized, one need to manually add "sys.path.append('/usr/share/pyshared')" to all python programs.

This is for python-serial 2.5.3 on KUbuntu Quantal 12.10