That's the tilde which makes the backport version of nexuiz-data a little bit less than 2.2.3-1, so the dependency is not met (>=2.2.3-1).
-- Can't upgrade nexuiz from edgy-backports https://launchpad.net/bugs/95002 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
