No, this is perfectly normal and reasonable behaviour. xss and gss do not conflict, so xss will not be removed. The dist-upgrader will do that afterwards as part of a "dist-upgrade cleanup" but this is not doable in apt without breaking both the xss and gss packages.
-- I got doubled "screensaver" entries in System->Preferences menu https://launchpad.net/bugs/42279 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
