You have been subscribed to a public bug: Debian's package managers have had this option on install since the early 2000s.
steps to find this 1) Click gear in top left hand corner 2) Software & Updates 3) Other Software tab 4) add the window then asks for "APT line:", ie something to insert into /etc/apt/sources.list -- of course what we should be doing here is adding our own mirror from the many mirrors in places like https://launchpad.net/ubuntu/+archivemirrors - but it would be far better for this (or some) list to be provided, and for the user to click on one of the available mirrors, in addition to having the ability to manually enter an 'apt' line here. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: gnome-software 3.20.1+git20160420.1.ca63436.ubuntu-xenial-0ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: GNOME Date: Sun Sep 4 13:48:00 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2014-07-09 (787 days ago) InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708) SourcePackage: gnome-software UpgradeStatus: Upgraded to xenial on 2016-08-16 (19 days ago) ** Affects: software-properties (Ubuntu) Importance: Wishlist Status: Triaged ** Tags: amd64 apport-bug third-party-packages xenial -- please consider showing list of apt mirrors to choose from https://bugs.launchpad.net/bugs/1620087 You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to software-properties in Ubuntu. -- 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