After upgrading my workstation to the 64-bit version of Ubuntu 12.04 (Precise Pangolin) (from 11.10) I realized that Skype did not start anymore. The problem was simply a missing 32-bit library and the problem is quickly fixed as follows.
Running Skype from the command line revealed the missing library:
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$ skype
skype: error while loading shared libraries: libXv.so.1: cannot open shared object file: No such file or directory
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Using ldd to check which libraries are dynamically linked confirmed that libXv is the only prerequisite that is missing, i.e., that is listed as "not found":
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$ ldd /usr/bin/skype
linux-gate.so.1 => (0xf7796000)
libasound.so.2 => /usr/lib/i386-linux-gnu/libasound.so.2 (0xf767d000)
libXv.so.1 => not found
libXss.so.1 => /usr/lib/i386-linux-gnu/libXss.so.1 (0xf7678000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf766f000)
libQtDBus.so.4 => /usr/lib/i386-linux-gnu/libQtDBus.so.4 (0xf75ef000)
libQtGui.so.4 => /usr/lib/i386-linux-gnu/libQtGui.so.4 (0xf6b1e000)
libQtNetwork.so.4 => /usr/lib/i386-linux-gnu/libQtNetwork.so.4 (0xf69d2000)
libQtCore.so.4 => /usr/lib/i386-linux-gnu/libQtCore.so.4 (0xf66f4000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf66d9000)
libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0xf65f4000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf65c8000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf65aa000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf6405000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf6400000)
libX11.so.6 => /usr/lib/i386-linux-gnu/libX11.so.6 (0xf62cc000)
libXext.so.6 => /usr/lib/i386-linux-gnu/libXext.so.6 (0xf62ba000)
libQtXml.so.4 => /usr/lib/i386-linux-gnu/libQtXml.so.4 (0xf627a000)
libdbus-1.so.3 => /lib/i386-linux-gnu/libdbus-1.so.3 (0xf6230000)
libfontconfig.so.1 => /usr/lib/i386-linux-gnu/libfontconfig.so.1 (0xf61fc000)
libaudio.so.2 => /usr/lib/i386-linux-gnu/libaudio.so.2 (0xf61e3000)
libglib-2.0.so.0 => /lib/i386-linux-gnu/libglib-2.0.so.0 (0xf60ea000)
libpng12.so.0 => /lib/i386-linux-gnu/libpng12.so.0 (0xf60c0000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xf60a9000)
libfreetype.so.6 => /usr/lib/i386-linux-gnu/libfreetype.so.6 (0xf600f000)
libgobject-2.0.so.0 => /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 (0xf5fbe000)
libSM.so.6 => /usr/lib/i386-linux-gnu/libSM.so.6 (0xf5fb5000)
libICE.so.6 => /usr/lib/i386-linux-gnu/libICE.so.6 (0xf5f9b000)
libXi.so.6 => /usr/lib/i386-linux-gnu/libXi.so.6 (0xf5f8a000)
libXrender.so.1 => /usr/lib/i386-linux-gnu/libXrender.so.1 (0xf5f80000)
/lib/ld-linux.so.2 (0xf7797000)
libxcb.so.1 => /usr/lib/i386-linux-gnu/libxcb.so.1 (0xf5f5f000)
libexpat.so.1 => /lib/i386-linux-gnu/libexpat.so.1 (0xf5f35000)
libXt.so.6 => /usr/lib/i386-linux-gnu/libXt.so.6 (0xf5ed8000)
libXau.so.6 => /usr/lib/i386-linux-gnu/libXau.so.6 (0xf5ed4000)
libpcre.so.3 => /lib/i386-linux-gnu/libpcre.so.3 (0xf5e98000)
libffi.so.6 => /usr/lib/i386-linux-gnu/libffi.so.6 (0xf5e91000)
libuuid.so.1 => /lib/i386-linux-gnu/libuuid.so.1 (0xf5e8b000)
libXdmcp.so.6 => /usr/lib/i386-linux-gnu/libXdmcp.so.6 (0xf5e83000)
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The 32-bit version of the library can easily be installed using:
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sudo apt-get install libxv1:i386
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You may need to install other 32-bit libraries if ldd lists more than one as "not found". Hope this helps somebody.
