I forgot about this bug, but I later realised that the problem was due to my installation of the OS from a daily cd version of the ISO file from http://cdimage.ubuntu.com/xubuntu/xenial/daily-live/pending/xenial-desktop-amd64.iso.zsync rather than the normal download site. I did not realise that the version from there has proposed repos enabled Apologies for not reporting this find before, but at least I now know what was the cause.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to software-properties in Ubuntu. https://bugs.launchpad.net/bugs/1592427 Title: I can't disable proposed updates Status in software-properties package in Ubuntu: Expired Bug description: Hi!! Accidentally I've enabled proposed updates in development section but now I can't disable it. I've rebooted the laptop but the issue isn't fixed. Regards!! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1592427/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp