Note that you can rename them yourself if you want. I don't know if media:/ (and system:/media) originally takes the names from the mount point or from the label on the drive, but ubuntu makes the mount point the label on the drive anyways so it'd be the same. So, by the information it has to go on, konqueror can not tell your breezy partition apart from your dapper partition. It's somewhat confusing, but a newbie probably won't have multiple / partitions anyways. If you'd like cfdisk during install to label the drives differently, please file a separate bug for that (I'm not sure for what package, but it's not kde/konqueror related), but IMO the mount point is a good label and that is unlikely to be changed.
Also, your title makes the bug sound much more serious than it is considering that system:/media is a mess in more dire ways (http://bugs.kde.org/simple_search.cgi?id=media%3A%2F&openonly=1) -- system:/media/ - what a mess https://launchpad.net/bugs/41376 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
