When I run qtcreator from the command line, I get the following error:
qtcreator: symbol lookup error: /usr/lib/x86_64-linux-gnu/libQt5Network.so.5: undefined symbol: _ZN16QLoggingCategoryD1Ev
If I type
nm -u /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
I get no symbols
The system is ubuntu 16.10
Edit: as requested by G.M., the results of ldd qtcreator are listed as below
linux-vdso.so.1 => (0x00007ffc73fc9000)
libExtensionSystem.so.1 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/qtcreator/libExtensionSystem.so.1 (0x00007f8298dc8000)
libAggregation.so.1 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/qtcreator/libAggregation.so.1 (0x00007f8298bc2000)
libUtils.so.1 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/qtcreator/libUtils.so.1 (0x00007f8298818000)
libQt5Widgets.so.5 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libQt5Widgets.so.5 (0x00007f8297fc9000)
libQt5Gui.so.5 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libQt5Gui.so.5 (0x00007f8297820000)
libQt5Concurrent.so.5 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libQt5Concurrent.so.5 (0x00007f829761a000)
libQt5Network.so.5 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libQt5Network.so.5 (0x00007f82972bc000)
libQt5Core.so.5 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libQt5Core.so.5 (0x00007f8296ba0000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 (0x00007f82968fb000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f82966de000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f829635b000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8296052000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8295e3c000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8295a72000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f829586e000) /lib64/ld-linux-x86-64.so.2 (0x000055c6ee10e000)
libQt5Qml.so.5 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/qtcreator/../Qt/lib/libQt5Qml.so.5 (0x00007f8295274000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f829505a000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f8294e51000)
libicui18n.so.56 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libicui18n.so.56 (0x00007f82949b7000)
libicuuc.so.56 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libicuuc.so.56 (0x00007f82945fe000)
libicudata.so.56 => /home/milo/Qt5.7.0/Tools/QtCreator/bin/./../lib/Qt/lib/libicudata.so.56 (0x00007f8292c1b000)
libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f8292a19000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f8292707000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f82924de000)
libxcb-dri3.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri3.so.0 (0x00007f82922db000)
libxcb-present.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-present.so.0 (0x00007f82920d7000)
libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f8291ed0000)
libxshmfence.so.1 => /usr/lib/x86_64-linux-gnu/libxshmfence.so.1 (0x00007f8291ccd000)
libglapi.so.0 => /usr/lib/x86_64-linux-gnu/libglapi.so.0 (0x00007f8291a9d000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f829188b000)
libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007f8291688000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f8291481000)
libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f829127f000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f8290f45000)
libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007f8290d2b000)
libxcb-dri2.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0 (0x00007f8290b26000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f8290904000)
libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007f82906fd000)
libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007f82904ee000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f829027d000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f8290079000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f828fe72000)
