I don't know, but this bug has been resolved in edgy. Try using the update manager to upgrade (using apt-get to upgrade is no longer recommended)
-- ia32-libs does not have a grasp on its dependancies - edgy eft https://launchpad.net/bugs/49490 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs