When you first run the./XXX file in Ubuntu 64-bit, you might say that bash doesn’t have that file or directory, but it does;
The reason is that there is no 32-bit runtime;

Solution:

$sudo apt-get install ia32-libs

If it says no packages are available, then install the alternative:

$sudo apt-get install libc6:i386 libgcc1:i386 gcc-4.6-base:i386 libstdc++5:i386 libstdc++6:i386

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