add 32 bit architecture in 64 bit Linux

add 32 bit architecture in 64 bit Linux.txt

Commands
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dpkg --print-architecture

sudo dpkg --add-architecture i386 && sudo apt update

apt-get install lib32z1 lib32ncurses5 lib32stdc++6
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dpkg --add-architecture i386   (enable multi-arch)

apt-get update

apt-get install libc6:i386   (install base 32bit libraries)

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Lekensteyn's answer conflicted with lots of existing packages for me (on 64-bit oneiric).

I instead did this, which pulled in the libc6-dev-i386 package:

apt-get install gcc-multilib