That version is now dead http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: software-properties (Ubuntu) Status: Confirmed => Invalid ** Changed in: ubuntu-gnome 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/1656100 Title: Unable to remove signing keys using gnome-software-properties To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-gnome/+bug/1656100/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs