Ahh, you're using 'unstable'. Living dangerously, eh? There are some programs (ie. emacs, fvwm2, xdaliclock + others) that incorrectly link with both libc5 and libc6. This wasn't a problem until you installed xlib6g, since you didn't have libc6-based X libs until then. Read my previous post, "Re: Emacs dumps core after some major upgrades on system" to see how to fix it. There has been lots of discussion on debian-devel about this.
BTW, upgrading problems with the 'unstable' distribution really belong in debian-devel. Cheers, - Jim
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