I've got a 32-bit Ubuntu installation running on 64-bit hardware. Now that multi-arch has been implemented, I would like to switch to 64-bit without having to reinstall the OS.
This is one of the user stories addressed by the spec:
Shawn installed his system using the 32-bit version of Ubuntu, but his hardware is 64-bit and he wants to switch over. He manually installs the amd64 versions of dpkg and apt, replacing the i386 versions and changing which architecture is used as the default; then he installs the amd64 ubuntu-minimal package; then he installs the amd64 ubuntu-desktop package. Over time the remaining i386 packages are replaced automatically on upgrade.
However, when trying to follow the instructions in there, I cannot find any 64-bit version of dpkg or apt.
Did this user story got implemented in a different way in the final spec, or do I need to do something differently?
In short, how can I switch my 32-bit installation to 64-bit?