I can no longer reproduce this issue. Perhaps it is related to the issues involving update-manager running in the background and running Synaptic at the same time.
** Changed in: synaptic (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/681628 Title: Can not change preferences in Synaptic Package Manager -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs