I recently ran into this. On my box, svgalib was crosslinked to libc6 -- so quake was linked to both libc5 and 6 so it segfaulted. To see if this has happened to you run ldd on your quake binary like this: ldd /usr/games/squake.real. If you see libc5 and libc6 then you have the bad lib package. Getting the new version and/or running ldconfig as root should fix it.
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