I've just asked upstream to comment on this issue. In the mean time, would this be a possible solution:
can the postinst of the new package force a restart of all the services (possibly including gdm et al to restart user sessions) which depend on the system bus? It's a bit ugly, but a. if this is an etch->lenny upgrade they will probably all be restarted anyway and b. it's still better than an actual reboot. We could have one of those debconf questions like libc6 has. Matt -- Matthew Johnson
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