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To run a 32-bit executable file on a 64-bit multi-architecture Ubuntu system, you have to add the i386 architecture and install the three library packages libc6:i386, libncurses5:i386, and libstdc++6:i386:

sudo dpkg –add-architecture i386
Or if you are using Ubuntu 12.04 LTS (Precise Pangolin) or below, use this:

echo “foreign-architecture i386” > /etc/dpkg/dpkg.cfg.d/multiarch
Then:

sudo apt-get update
sudo apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386
If fails, do also

sudo apt-get install multiarch-support
After these steps, you should be able to run the 32-bit application