/etc/apt/sources.list contains this section:
------------
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu maverick partner
# deb-src http://archive.canonical.com/ubuntu maverick partner
------------
So I guess this is a bug in apt-setup, not software-center.
/etc/apt/ sources. list contains this section: archive. canonical. com/ubuntu maverick partner archive. canonical. com/ubuntu maverick partner
------------
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://
# deb-src http://
------------
So I guess this is a bug in apt-setup, not software-center.