Install the same 64-bit packages as a 32-bit Xubuntu installation

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http://unix.stackexchange.com – I have been using a virtual machine (Xubuntu 12.10, with VMWare on a windows host) for all my programming work, which I am trying to transition from a 32-bit install to a 64-bit install. I am hoping to be able to automatically re-install all the packages I have been using in the 32-bit VM in my new 64-bit VM. Reading these instructions, I ran sudo dpkg --get-selections to get a list of installed packages, but many of the packages have an :i386 suffix. Is there an easy way to install the corresponding 64-bit packages? Am I safe to replace :i386 with :x86_64 or something similar in my package (HowTos)