Hi, I'm too tired to think, but this is probably (the same) gtk-qt-engine bug, not a libc6 bug?
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Preparing to replace libc6 2.3.6.ds1-13 (using
.../archives/libc6_2.5-1_amd64.deb) ...
Unpacking replacement libc6 ...
dpkg: error processing /var/cache/apt/archives/libc6_2.5-1_amd64.deb (--unpack):
trying to overwrite `/usr/lib64', which is also in package gtk-qt-engine
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Sami
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