As a workaround, I did this to replace the problematic comments with ASCII-friendly ones. Notice that this only works with the Spanish locale. You must replace the message according with what message is shown to you on the comment section.
sudo sed -ri 's/(.*)\(desactivado en la actualización a raring\)(.*)/\1disabled on update\2/' /etc/apt/sources.list.d/*.list -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1069019 Title: [software-properties-gtk] can not delete, enable or modify any software source with non-ASCII characters in the comment To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1069019/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs