For me it stayed empty after rechecking. Dunno if it has something to do with it, but I use the http://de.archive.ubuntu.com/ mirror. I use gpg, so I have now updated - I'll check again when the next security fix comes out.
-- update-manager shows no changelog for various packages https://launchpad.net/bugs/40058 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
