[SOLVED] How to help an executable find a shared library?

How to help an executable find a shared library?

I'm trying to run RF-TrulyMagical, but it says:

error while loading shared libraries: libSM.so.6: cannot open shared object file: No such file or directory

I've tried re-installing the library and running apt-get update and ldconfig, but nothing's changed. The library is at /lib/x86_64-linux-gnu and that path was already listed (I didn't add it myself) in a file inside the /etc/ld.so.conf.d directory. Output for ldd RF-TrulyMagical is:

    linux-gate.so.1 (0xf7fa1000)
    libSM.so.6 => not found
    libICE.so.6 => not found
    libXext.so.6 => /usr/lib/i386-linux-gnu/libXext.so.6 (0xf7f6f000)
    libX11.so.6 => /usr/lib/i386-linux-gnu/libX11.so.6 (0xf7e25000)
    libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf7e20000)
    librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf7e16000)
    libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7df7000)
    libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0xf7c71000)
    libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf7b6f000)
    libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf7b51000)
    libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7973000)
    /lib/ld-linux.so.2 (0xf7fa2000)
    libxcb.so.1 => /usr/lib/i386-linux-gnu/libxcb.so.1 (0xf7947000)
    libXau.so.6 => /usr/lib/i386-linux-gnu/libXau.so.6 (0xf7943000)
    libXdmcp.so.6 => /usr/lib/i386-linux-gnu/libXdmcp.so.6 (0xf793c000)
    libbsd.so.0 => /lib/i386-linux-gnu/libbsd.so.0 (0xf7921000)

Somewhere it said I should install lib32-libsm, but apt-get says Unable to locate package.

I have no idea what to do. Thanks in advance. (I'm running Ubuntu 18.04.1, if that helps)

Solution

Might be a simple case of:

apt-get install libsm6:i386