I have added an external repository manually to the sources.list after installing Xubuntu and I forgot about it. Software-properties was behaving abnormally because of that. When I removed the added part, it worked as expected.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1078592 Title: Cannot make changes on software-properties-gtk To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1078592/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
