Eu tenho um conhecimento limitado de como o linux funciona, mas tentarei explicar meu problema da forma mais clara possível.
Recentemente, tentei instalar o wallch no Ubuntu 15.04, mas não consegui iniciá-lo. Ao iniciá-lo do terminal, recebi o seguinte erro:
This application failed to start because it could not find or load the Qt platform plugin "xcb".
Reinstalling the application may fix this problem.
Abandon (core dumped)
Pesquisando no erro, descobri que ldd poderia ajudar-me a entender a origem do problema. Eu tentei e me deu os seguintes resultados:
$ ldd /usr/bin/wallch
linux-vdso.so.1 => (0x00007ffeccfc6000)
libunity.so.9 => /usr/lib/x86_64-linux-gnu/libunity.so.9 (0x00007fce6414b000)
libdbusmenu-glib.so.4 => /usr/lib/x86_64-linux-gnu/libdbusmenu-glib.so.4 (0x00007fce63f2e000)
libnotify.so.4 => /usr/lib/x86_64-linux-gnu/libnotify.so.4 (0x00007fce63d26000)
libexif.so.12 => /usr/lib/x86_64-linux-gnu/libexif.so.12 (0x00007fce63ae2000)
libgtk-x11-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 (0x00007fce63497000)
libgio-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 (0x00007fce63117000)
libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007fce62ec5000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fce62bb6000)
libQt5WebKitWidgets.so.5 => /usr/lib/x86_64-linux-gnu/libQt5WebKitWidgets.so.5 (0x00007fce645a1000)
libQt5Widgets.so.5 => /opt/pgmodeler/lib/libQt5Widgets.so.5 (0x00007fce62331000)
libQt5WebKit.so.5 => /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5 (0x00007fce5feb8000)
libQt5Gui.so.5 => /opt/pgmodeler/lib/libQt5Gui.so.5 (0x00007fce5f6fa000)
libQt5Network.so.5 => /opt/pgmodeler/lib/libQt5Network.so.5 (0x00007fce5f394000)
libQt5Core.so.5 => /opt/pgmodeler/lib/libQt5Core.so.5 (0x00007fce5ec58000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fce5e949000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fce5e641000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fce5e42b000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fce5e061000)
libgmodule-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007fce5de5d000)
libdee-1.0.so.4 => /usr/lib/x86_64-linux-gnu/libdee-1.0.so.4 (0x00007fce5dc22000)
libunity-protocol-private.so.0 => /usr/lib/x86_64-linux-gnu/libunity/libunity-protocol-private.so.0 (0x00007fce5d9da000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fce5d7bc000)
libgdk_pixbuf-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0 (0x00007fce5d59a000)
libgdk-x11-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 (0x00007fce5d2e4000)
libpangocairo-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so.0 (0x00007fce5d0d7000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fce5cd9e000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007fce5cb98000)
libatk-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libatk-1.0.so.0 (0x00007fce5c973000)
libcairo.so.2 => /usr/lib/x86_64-linux-gnu/libcairo.so.2 (0x00007fce5c65d000)
libpangoft2-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so.0 (0x00007fce5c447000)
libpango-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0 (0x00007fce5c1f9000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007fce5bfbb000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fce5bda0000)
libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007fce5bb7c000)
libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007fce5b960000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007fce5b758000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fce5b4eb000)
libQt5PrintSupport.so.5 => /opt/pgmodeler/lib/libQt5PrintSupport.so.5 (0x00007fce5b27b000)
libQt5OpenGL.so.5 => /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5 (0x00007fce6453c000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fce5b073000)
libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007fce5ae69000)
libXcomposite.so.1 => /usr/lib/x86_64-linux-gnu/libXcomposite.so.1 (0x00007fce5ac66000)
libjpeg.so.8 => /usr/lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007fce5aa11000)
libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0 (0x00007fce5a7eb000)
libxslt.so.1 => /usr/lib/x86_64-linux-gnu/libxslt.so.1 (0x00007fce5a5ae000)
libxml2.so.2 => /usr/lib/x86_64-linux-gnu/libxml2.so.2 (0x00007fce5a1e5000)
libgstreamer-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0 (0x00007fce59ed4000)
libgstapp-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstapp-1.0.so.0 (0x00007fce59cc7000)
libgstbase-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstbase-1.0.so.0 (0x00007fce59a68000)
libgstpbutils-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0 (0x00007fce5983f000)
libgstvideo-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0 (0x00007fce595f2000)
libgstaudio-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstaudio-1.0.so.0 (0x00007fce593a3000)
libsqlite3.so.0 => /usr/lib/x86_64-linux-gnu/libsqlite3.so.0 (0x00007fce590dd000)
libicui18n.so.52 => /usr/lib/x86_64-linux-gnu/libicui18n.so.52 (0x00007fce58ccb000)
libicuuc.so.52 => /usr/lib/x86_64-linux-gnu/libicuuc.so.52 (0x00007fce5894d000)
libQt5Quick.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 (0x00007fce58560000)
libQt5Qml.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 (0x00007fce5812d000)
libQt5Sql.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Sql.so.5 (0x00007fce644f4000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 (0x00007fce57e91000)
libicui18n.so.53 => /opt/pgmodeler/lib/libicui18n.so.53 (0x00007fce57a45000)
libicuuc.so.53 => /opt/pgmodeler/lib/libicuuc.so.53 (0x00007fce576ba000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fce574b6000)
libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fce572b4000)
/lib64/ld-linux-x86-64.so.2 (0x00007fce643ef000)
libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007fce570b1000)
libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007fce56ea1000)
libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007fce56c97000)
libXcursor.so.1 => /usr/lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007fce56a8d000)
libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007fce5688a000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007fce56678000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fce563d0000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fce561b1000)
libpixman-1.so.0 => /usr/lib/x86_64-linux-gnu/libpixman-1.so.0 (0x00007fce55f04000)
libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fce55d01000)
libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fce55af8000)
libharfbuzz.so.0 => /usr/lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007fce558a1000)
libthai.so.0 => /usr/lib/x86_64-linux-gnu/libthai.so.0 (0x00007fce55698000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fce5546f000)
liborc-0.4.so.0 => /usr/lib/x86_64-linux-gnu/liborc-0.4.so.0 (0x00007fce551eb000)
libgsttag-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgsttag-1.0.so.0 (0x00007fce54fb0000)
libicudata.so.52 => /usr/lib/x86_64-linux-gnu/libicudata.so.52 (0x00007fce53743000)
libdouble-conversion.so.1 => /usr/lib/x86_64-linux-gnu/libdouble-conversion.so.1 (0x00007fce53532000)
libglapi.so.0 => /usr/lib/x86_64-linux-gnu/libglapi.so.0 (0x00007fce53308000)
libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fce53106000)
libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007fce52eef000)
libxcb-dri2.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0 (0x00007fce52cea000)
libxcb-dri3.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri3.so.0 (0x00007fce52ae7000)
libxcb-present.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-present.so.0 (0x00007fce528e4000)
libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fce526de000)
libxshmfence.so.1 => /usr/lib/x86_64-linux-gnu/libxshmfence.so.1 (0x00007fce524dc000)
libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007fce522d6000)
libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007fce520c9000)
libicudata.so.53 => /opt/pgmodeler/lib/libicudata.so.53 (0x00007fce50a41000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fce5083d000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fce50637000)
libgraphite2.so.3 => /usr/lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007fce5041b000)
libdatrie.so.1 => /usr/lib/x86_64-linux-gnu/libdatrie.so.1 (0x00007fce50214000)
Vi que wallch parecia usar bibliotecas de compartilhamento localizadas em /opt/pgmodeler/lib/ (libQt5Widgets.so.5, por exemplo). pgModeler é um software que eu instalei anteriormente mas não está relacionado a wallch , então achei estranho que as bibliotecas compartilhadas não estejam todas na pasta /usr/lib/x86_64-linux-gnu/ .
Por isso, tentei reinstalar wallch após desinstalar pgModeler . Funcionou bem e todas as bibliotecas compartilhadas usadas por wallch estavam localizadas na pasta /usr/lib/x86_64-linux-gnu/ .
Depois tentei reinstalar pgModeler e ele me colocou de volta na primeira situação: wallch não inicia e dá o mesmo erro e tenta usar as bibliotecas compartilhadas localizadas em /opt/pgmodeler/lib/ .
Existe uma maneira de ter esses dois programas trabalhando juntos? Talvez especificando manualmente a localização das bibliotecas compartilhadas para wallch ?