the switch from x86 to x64 (which is also non-trivial to do on Debian, btw).
FYI, with the new multi-arch support, it's a lot easier. Still not trivial, but I did it without too much trouble on a Ubuntu 12.10 machine. From here:
It took some finagling, which was mostly just downloading and installing more packages in the same manner as listed above.# dpkg --print-architecture i386 # dpkg --add-architecture amd64 # dpkg --print-foreign-architectures amd64 # apt-get update # apt-get download gcc-4.6-base:amd64 libgcc1:amd64 libc6:amd64 libselinux1:amd64 zlib1g:amd64 libbz2-1.0:amd64 dpkg:amd64 # dpkg -i *.deb # dpkg --print-architecture amd64 # dpkg --print-foreign-architectures i386If you got this far you are now effectively running amd64, but with mostly i386 packages. You can try to replace them with the corresponding amd64 packages. If that doesn't work (it is expected that not all libraries will be converted to Multiarch in wheezy) simply remove the i386 package and install the amd64 version instead.
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