On one 64-bit system:
Calculating upgrade... Done
The following packages will be REMOVED:
linux-headers-3.11-5.towo-siduction-amd64
linux-headers-3.11-6.towo-siduction-amd64
linux-headers-3.12-0.towo-siduction-amd64 linux-headers-siduction-amd64
The following packages have been kept back:
cpp-4.8 g++-4.8 gcc-4.8 gcc-4.8-base libasan0 libatomic1 libgcc-4.8-dev
libgcc1 libgfortran3 libgomp1 libitm1 libquadmath0 libstdc++-4.8-dev
libstdc++6 libtsan0
The following packages will be upgraded:
gcj-4.8-jre-lib libgcj14 libhunspell-1.3-0 linux-libc-dev texlive-base
texlive-luatex
6 upgraded, 0 newly installed, 4 to remove and 15 not upgraded.
A 32-bit system does not have this problem.
It is a day to be careful.
EDIT: d-u went through as expected 6 hours later.