Comment 9 for bug 715707

Importance is assigned with respect to Ubuntu as a whole, not relative to the individual package affected. And it's the importance of the bug overall (including the users experiencing it), rather than just to the users experiencing it. If this affected all users of the Computer Janitor, it might be rated higher. As it is, most users are probably able to use the Computer Janitor without problems.

Still, it seems to me that the argument could be made that since the Computer Janitor is one of the administration tools that all Ubuntu users should be able to rely on, the bug should be Medium rather than Low.