Q: Which 32-bit libraries are not available on 64-bit Ubuntu Lucid?

Answer

The 64-bit version of Ubuntu Lucid includes many 32-bit libraries for compatibility purposes. These libraries are in the ia32-libs package. Most libraries you'll need are available in both 64-bit and 32-bit versions. However, the following libraries are not available. If a software package uses any of these libraries, it will need to be rebuilt for 64-bit support.

lib2Dfft.so
libaa.so
libadns.so
libagraph.so
libAiksaurus-1.2.so
libAiksaurusGTK-1.2.so
libalut.so
libamd.so
libapm.so
libapparmor.so
libapr-1.so
libaprutil-1.so
libapt-inst-libc6.9-6.so
libapt-pkg-libc6.9-6.so
libaqbanking.so
libaqhbci.so
libaqnone.so
libaqofxconnect.so
libarchive.so
libares.so
libart_lgpl.so
libasn1.so
libaspell.so
libasprintf.so
libass.so
libast.so
libathdir.so
libatkmm-1.6.so
libatlas.so
libatm.so
libavahi-core.so
libavahi-glib.so
libavahi-gobject.so
libavahi-ui.so
libavc1394.so
libavcall.so
libavcodec.so
libavdevice.so
libavfilter.so
libavformat.so
libavutil.so
libbeecrypt.so
libbind9.so
libblas.so
libblastapi.so
libblastcompadj.so
libblast.so
libblkid.so
libBLT.2.4.so
libBLTlite.2.4.so
libbonoboui-2.so
libboost_date_time-mt.so
libboost_filesystem-mt.so
libboost_graph-mt.so
libboost_iostreams-mt.so
libboost_prg_exec_monitor-mt.so
libboost_program_options-mt.so
libboost_python-gcc41-1_34_1-py25.so
libboost_python-gcc41-1_34_1-py26.so
libboost_python-gcc41-mt-1_34_1-py25.so
libboost_python-gcc41-mt-1_34_1-py26.so
libboost_python-gcc42-1_34_1-py25.so
libboost_python-gcc42-1_34_1-py26.so
libboost_python-gcc42-1_34_1.so
libboost_python-gcc42-mt-1_34_1-py25.so
libboost_python-gcc42-mt-1_34_1-py26.so
libboost_python-gcc42-mt-1_34_1.so
libboost_python-mt-py25.so
libboost_python-mt-py26.so
libboost_regex-gcc41-1_34_1.so
libboost_regex-gcc41-mt-1_34_1.so
libboost_regex-gcc42-1_34_1.so
libboost_regex-gcc42-mt-1_34_1.so
libboost_regex-mt.so
libboost_serialization-mt.so
libboost_signals-gcc41-1_34_1.so
libboost_signals-gcc41-mt-1_34_1.so
libboost_signals-gcc42-1_34_1.so
libboost_signals-gcc42-mt-1_34_1.so
libboost_signals-mt.so
libboost_system-mt.so
libboost_thread-mt.so
libboost_unit_test_framework-mt.so
libboost_wave-mt.so
libboost_wserialization-mt.so
libbrlapi.so
libbtf.so
libcaca.so
libcaca++.so
libcairomm-1.0.so
libcallback.so
libcamd.so
libcamel-1.2.so
libcamel-provider-1.2.so
libcblas.so
libccolamd.so
libcdda_interface.so
libcdda_paranoia.so
libcdio_cdda.so
libcdio_paranoia.so
libcdio.so
libcdt.so
libcelt.so
libcgraph.so
libcholmod.so
libck-connector.so
libcln.so
libcolamd.so
libcompface.so
libcsirocsa.so
libcsironn.so
libcsparse.so
libcucul.so
libcucul++.so
libcurl-gnutls.so
libcvaux.so
libcv.so
libcwidget.so
libcxcore.so
libcxsparse.so
libdaemon.so
libdatrie.so
libdb1.so
libdb.so
libdc1394.so
libdca.so
libddvlib.so
libdes425.so
libdevmapper.so
libdf.so
libdirect-1.0.so
libdirectfb-1.0.so
libdiscid.so
libdjvulibre.so
libdmx.so
libdns_sd.so
libdns.so
libdvbpsi.so
libdvdnavmini.so
libdvdnav.so
libdvdread.so
libdv.so
libDXcallm.so
libDXlite.so
libDXL.so
libDX.so
libe2p.so
libebackend-1.2.so
libebml.so
libebook-1.2.so
libecal-1.2.so
libedata-book-1.2.so
libedata-cal-1.2.so
libedataserver-1.2.so
libedataserverui-1.2.so
libedit.so
libegroupwise-1.2.so
libelf.so
libenca.so
libenchant.so
libept.so
libesd.so
libestbase.so
libestools.so
libeststring.so
libevent-1.1a.so
libevent-1.1.so
libevent-1.3b.so
libevent-1.3d.so
libevent-1.3e.so
libevent.so
libexchange-storage-1.2.so
libexempi.so
libexpect.so
libext2fs.so
libf2c_i2.so
libf2c.so
libf77blas.so
libfaac.so
libfaad.so
libfam.so
libfcgi.so
libfcgi++.so
libffado.so
libffi.so
libfft.so
libfftw3f.so
libfftw3f_threads.so
libfftw3l.so
libfftw3l_threads.so
libfftw3.so
libfftw3_threads.so
libfftw_mpi.so
libfftw.so
libfftw_threads.so
libfmpich.so
libfontenc.so
libfreebob.so
libfribidi.so
libFS.so
libftgl.so
libfuse.so
libfusion-1.0.so
libg2c.so
libgadu.so
libgamin-1.so
libgccpp.so
libgcj_bc.so
libgcj.so
libgcj-tools.so
libgcr.so
libgc.so
libgdata-1.2.so
libgdata-google-1.2.so
libgdiplus.so
libgdk-1.2.so
libgdk_imlib.so
libgdkmm-2.4.so
libgdk_pixbuf.so
libgdk_pixbuf_xlib.so
libgdome.so
libgd.so
libgeda.so
libgettextpo.so
libgfortran.so
libggi.so
libgg.so
libgif.so
libgii.so
libgij.so
libginac-1.4.so
libgiomm-2.4.so
libgksu2.so
libglib-1.2.so
libglibmm-2.4.so
libglibmm_generate_extra_defs-2.4.so
libglitz-glx.so
libglitz.so
libglpk.so
libGL.so
libgluezilla.so
libglui.so
libgmetadom_gdome_cpp_smart.so
libgmodule-1.2.so
libgmpxx.so
libgnome-2.so
libgnomecups-1.0.so
libgnome-desktop-2.so
libgnomekbd.so
libgnomekbdui.so
libgnome-media-profiles.so
libgnome-menu.so
libgnomeprint-2-2.so
libgnomeprintui-2-2.so
libgnome.so
libgnomesupport.so
libgnomeui-2.so
libgnomeui.so
libgnomevfs-2.so
libgnome-window-settings.so
libgnorbagtk.so
libgnorba.so
libgnt.so
libgoffice-0.6.so
libgp11.so
libgpgme-pthread.so
libgpgme-pth.so
libgpgme.so
libgpilotdcm.so
libgpilotdconduit.so
libgpilotd.so
libgpm.so
libgpvm3.so
libGraphicsMagick.so
libGraphicsMagick++.so
libGraphicsMagickWand.so
libgraph.so
libgrove.so
libgsasl.so
libgsf-gnome-1.so
libgssapi.so
libgssglue.so
libgs.so
libgssrpc.so
libgthread-1.2.so
libgtk-1.2.so
libgtkembedmoz.so
libgtkgl-2.0.so
libgtkgl.so
libgtkhtml-2.so
libgtkhtml-3.14.so
libgtkhtml-editor.so
libgtkmathview_custom_reader.so
libgtkmathview_gmetadom.so
libgtkmathview_libxml2_reader.so
libgtkmathview_libxml2.so
libgtkmm-2.4.so
libgtksourceview-1.0.so
libgtkspell.so
libgtk-vnc-1.0.so
libgtop-2.0.so
libgucharmap.so
libguile-cairo.so
libguilegtk-1.2.so
libguile-ltdl.so
libguilereadline-v-12.so
libguilereadline-v-17.so
libguile.so
libguile-srfi-srfi-13-14-v-1.so
libguile-srfi-srfi-13-14-v-3.so
libguile-srfi-srfi-1-v-3.so
libguile-srfi-srfi-4-v-1.so
libguile-srfi-srfi-4-v-3.so
libguile-srfi-srfi-60-v-2.so
libgvc.so
libgvfscommon-dnssd.so
libgvfscommon.so
libgweather.so
libgwenhywfar.so
libHalf.so
libhal-storage.so
libhdf5-1.6.6.so
libhdf5_cpp-1.6.6.so
libhdf5_hl-1.6.6.so
libheimntlm.so
libhesiod.so
libhighgui.so
libhistory.so
libhunspell-1.2.so
libhx509.so
libhyphen.so
libical.so
libicalss.so
libicalvcal.so
libicudata.so
libicui18n.so
libicuio.so
libicule.so
libiculx.so
libicutu.so
libicuuc.so
libid3tag.so
libIDL-0.6.so
libiec61883.so
libIex.so
libIIOP.so
libIlmImf.so
libIlmThread.so
libImath.so
libImlib2.so
libindicate.so
libinotifytools.so
libInventor.so
libInventorXt.so
libipecanvas.so
libipemodel.so
libipe.so
libisccc.so
libisccfg.so
libisc.so
libiso9660.so
libitpp.so
libiw.so
libjack-0.100.0.so
libjasper.so
libkadm5clnt.so
libkadm5srv.so
libkdb5.so
libklu.so
libkpathsea.so
libkrb4.so
libksba.so
libktoblzcheck.so
liblapack_atlas.so
liblapack.so
liblaunchpad-integration.so
libldl.so
liblink-grammar.so
liblirc_client.so
liblockdev.so
liblockfile.so
libloudmouth-1.so
liblpint-bonobo.so
liblua50.so
liblua5.1.so
liblualib50.so
liblwres.so
libMagickCore.so
libMagick++.so
libMagickWand.so
libmagic.so
libmaloc.so
libmathview_backend_gtk.so
libmathview_backend_ps.so
libmathview_backend_svg.so
libmathview_frontend_custom_reader.so
libmathview_frontend_gmetadom.so
libmathview_frontend_libxml2_reader.so
libmathview_frontend_libxml2.so
libmathview.so
libmatroska.so
libmcpp.so
libmcrypt.so
libmeanwhile.so
libmetacity-private.so
libmetamail.so
libmfhdf.so
libmhash.so
libml.so
libmng.so
libmodplug.so
libmoira.so
libmonodebuggerreadline.so
libmonodebuggerserver.so
libmono-profiler-aot.so
libmono-profiler-cov.so
libmono-profiler-logging.so
libmono.so
libmozjs.so
libmp3lame.so
libmpcdec.so
libmpeg2convert.so
libmpeg2.so
libmpe.so
libmpfr.so
libmpich.so
libmrclient.so
libmusicbrainz3.so
libmysqlclient_r.so
libmysqlclient.so
libnautilus-extension.so
libncbiacc.so
libncbiCacc.so
libncbicdr.so
libncbicn3dOGL.so
libncbicn3d.so
libncbidesk.so
libncbiid1.so
libncbimla.so
libncbimmdb.so
libncbiNacc.so
libncbiobj.so
libncbi.so
libncbitool.so
libncbitxc2.so
libneon-gnutls.so
libneon.so
libnetblast.so
libnetcdf_c++.so
libnetcdff.so
libnetcdf.so
libnetcli.so
libnetentr.so
libnetpbm.so
libnetsnmpagent.so
libnetsnmphelpers.so
libnetsnmpmibs.so
libnetsnmp.so
libnetsnmptrapd.so
libnewt.so
libnfsidmap_nsswitch.so
libnfsidmap.so
libnfsidmap_static.so
libnfsidmap_umich_ldap.so
libnm_glib.so
libnm_glib_vpn.so
libnm-util.so
libnotify.so
libnss_afspag.so
libntfs-3g.so
libntlm.so
libofx.so
liboobs-1.so
libopenobex.so
libORBitCosNaming.so
libORBit.so
libORBitutil.so
libosp.so
libots-1.so
libpanel-applet-2.so
libpangomm-1.4.so
libpaper.so
libpari-gmp.so
libparted-1.8.so
libpathplan.so
libpcap.so
libpciaccess.so
libpci.so
libpcrecpp.so
libpcsclite.so
libperl.so
libphononexperimental.so
libphonon.so
libpisock.so
libpisync.so
libplot.so
libplotter.so
libplplotcxxd.so
libplplotd.so
libpmpich.so
libpmpich++.so
libpolkit-dbus.so
libpolkit-gnome.so
libpolkit-grant.so
libpolkit.so
libpoppler-glib.so
libpoppler.so
libpostproc.so
libpq.so
libproxy.so
libpspell.so
libpstoedit.so
libpth.so
libpulsecore.so
libpurple-client.so
libpurple.so
libpvm3.so
libpx.so
libpyglib-2.0-python2.5.so
libpyglib-2.0-python2.6.so
libpython2.5.so
libqbanking.so
libqhull.so
libQtAssistantClient.so
libQtDesignerComponents.so
libQtDesigner.so
libQtHelp.so
libqthreads.so
libqt-mt.so
libqui.so
libQVTK.so
librarian.so
libraw1394.so
libreadline.so
librecode.so
libremctl.so
librfftw_mpi.so
librfftw.so
librfftw_threads.so
libroken.so
librom1394.so
librpcsecgss.so
libruby1.8.so
libschroedinger-1.0.so
libscrollkeeper.so
libsensors.so
libsexy.so
libshout.so
libsigsegv.so
libsilc-1.1.so
libsilcclient-1.1.so
libslang.so
libslp.so
libsmbclient.so
libsmokeqt.so
libsnmp.so
libsocks.so
libsoup-2.4.so
libsoup-gnome-2.4.so
libsox.so
libspeex.so
libspgrove.so
libsp.so
libsqlite.so
libss.so
libstartup-notification-1.so
libstlport_gcc.so
libstroke.so
libstyle.so
libsvn_client-1.so
libsvn_delta-1.so
libsvn_diff-1.so
libsvn_fs-1.so
libsvn_fs_base-1.so
libsvn_fs_fs-1.so
libsvn_fs_util-1.so
libsvn_ra-1.so
libsvn_ra_dav-1.so
libsvn_ra_local-1.so
libsvn_ra_neon-1.so
libsvn_ra_svn-1.so
libsvn_repos-1.so
libsvn_subr-1.so
libsvn_swig_perl-1.so
libsvn_wc-1.so
libswscale.so
libsysfs.so
libt1.so
libt1x.so
libtag.so
libtalloc.so
libtar.so
libtcl8.4.so
libtcl8.5.so
libtclx8.4.so
libthai.so
libtheoradec.so
libtheoraenc.so
libtheora.so
libticw.so
libtidy-0.99.so
libtiffxx.so
libtk8.4.so
libtk8.5.so
libts-0.0.so
libttf.so
libtvmpich.so
libtwolame.so
libuclmmbase.so
libUil.so
libulockmgr.so
libumfpack.so
libungif.so
libunique-1.0.so
libuniquewm-1.0.so
libuno_cppuhelpergcc3.so
libuno_cppu.so
libuno_purpenvhelpergcc3.so
libuno_salhelpergcc3.so
libuno_sal.so
libvcdinfo.so
libvdemgmt.so
libvdeplug.so
libvibgif.so
libvibnet.so
libvibrantOGL.so
libvibrant.so
libvisual-0.4.so
libvlccore.so
libvlc.so
libvolume_id.so
libvte.so
libvtkCommonPythonD.so
libvtkCommon.so
libvtkCommonTCL.so
libvtkDICOMParser.so
libvtkexoIIc.so
libvtkFilteringPythonD.so
libvtkFiltering.so
libvtkFilteringTCL.so
libvtkftgl.so
libvtkGenericFilteringPythonD.so
libvtkGenericFiltering.so
libvtkGenericFilteringTCL.so
libvtkGraphicsPythonD.so
libvtkGraphics.so
libvtkGraphicsTCL.so
libvtkHybridPythonD.so
libvtkHybrid.so
libvtkHybridTCL.so
libvtkImagingPythonD.so
libvtkImaging.so
libvtkImagingTCL.so
libvtkIOPythonD.so
libvtkIO.so
libvtkIOTCL.so
libvtkNetCDF.so
libvtkParallelPythonD.so
libvtkParallel.so
libvtkParallelTCL.so
libvtkRenderingPythonD.so
libvtkRenderingPythonTkWidgets.so
libvtkRendering.so
libvtkRenderingTCL.so
libvtksys.so
libvtkVolumeRenderingPythonD.so
libvtkVolumeRendering.so
libvtkVolumeRenderingTCL.so
libvtkWidgetsPythonD.so
libvtkWidgets.so
libvtkWidgetsTCL.so
libwavpack.so
libwbclient.so
libwind.so
libwnck-1.so
libwpd-0.8.so
libwpg-0.1.so
libwpg-stream-0.1.so
libwps-0.1.so
libwps-stream-0.1.so
libwv-1.2.so
libwx_baseu-2.6.so
libwx_baseu-2.8.so
libwx_baseu_net-2.6.so
libwx_baseu_net-2.8.so
libwx_baseu_xml-2.6.so
libwx_baseu_xml-2.8.so
libwx_gtk2u_adv-2.6.so
libwx_gtk2u_adv-2.8.so
libwx_gtk2u_animate-2.6.so
libwx_gtk2u_aui-2.8.so
libwx_gtk2u_core-2.6.so
libwx_gtk2u_core-2.8.so
libwx_gtk2u_deprecated-2.6.so
libwx_gtk2u_fl-2.6.so
libwx_gtk2u_fl-2.8.so
libwx_gtk2u_gizmos-2.6.so
libwx_gtk2u_gizmos-2.8.so
libwx_gtk2u_gizmos_xrc-2.6.so
libwx_gtk2u_gizmos_xrc-2.8.so
libwx_gtk2u_gl-2.6.so
libwx_gtk2u_gl-2.8.so
libwx_gtk2u_html-2.6.so
libwx_gtk2u_html-2.8.so
libwx_gtk2u_media-2.6.so
libwx_gtk2u_media-2.8.so
libwx_gtk2u_mmedia-2.6.so
libwx_gtk2u_ogl-2.6.so
libwx_gtk2u_ogl-2.8.so
libwx_gtk2u_plot-2.6.so
libwx_gtk2u_plot-2.8.so
libwx_gtk2u_qa-2.6.so
libwx_gtk2u_qa-2.8.so
libwx_gtk2u_richtext-2.8.so
libwx_gtk2u_stc-2.6.so
libwx_gtk2u_stc-2.8.so
libwx_gtk2u_svg-2.6.so
libwx_gtk2u_svg-2.8.so
libwx_gtk2u_xrc-2.6.so
libwx_gtk2u_xrc-2.8.so
libx264.so
libxapian.so
libxcb-shape.so
libxcb-shm.so
libxcb-xv.so
libXevie.so
libXfont.so
libxine.so
libxkbfile.so
libxkbui.so
libxklavier.so
libxmi.so
libxml++-2.6.so
libxmmsclient-glib.so
libxmmsclient.so
libxpcomglue.so
libxpcom.so
libXprintAppUtil.so
libXprintUtil.so
libXRes.so
libXTrap.so
libxul.so
libxvidcore.so
libXvMC.so
libXvMCW.so
libXxf86dga.so
libXxf86misc.so
libyaml-0.so
libytnef.so
libzephyr.so