cant open qt based applications such as qbittorrent, nomacs, etc . Getting error:

nomacs: error while loading shared libraries: libicui18n.so.56: cannot open shared object file: No such file or directory

qbittorrent: error while loading shared libraries: libicui18n.so.56: cannot open shared object file: No such file or directory

SOLVED :: sudo apt install --reinstall libqt5widgets5 libqt5gui5 libqt5dbus5 libqt5network5 libqt5core5a
This solved the problem

Output of ldd for qbittorrent:

linux-vdso.so.1 (0x00007ffe988ee000)

    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f8af08ad000)

    libcrypto.so.1.1 => /lib/x86_64-linux-gnu/libcrypto.so.1.1 (0x00007f8af05d7000)

    libtorrent-rasterbar.so.10 => /lib/x86_64-linux-gnu/libtorrent-rasterbar.so.10 (0x00007f8af0178000)

    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f8af0155000)

    libQt5Widgets.so.5 => /lib/x86_64-linux-gnu/libQt5Widgets.so.5 (0x00007f8aefaba000)

    libQt5Gui.so.5 => /lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x00007f8aef4cf000)

    libQt5DBus.so.5 => /lib/x86_64-linux-gnu/libQt5DBus.so.5 (0x00007f8aef431000)

    libQt5Network.so.5 => /lib/x86_64-linux-gnu/libQt5Network.so.5 (0x00007f8aef270000)

    libQt5Xml.so.5 => /lib/x86_64-linux-gnu/libQt5Xml.so.5 (0x00007f8aef22e000)

    libQt5Core.so.5 => /lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007f8aeea38000)

    libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f8aee856000)

    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8aee707000)

    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8aee6ea000)

    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8aee4f8000)

    /lib64/ld-linux-x86-64.so.2 (0x00007f8af123a000)

    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f8aee4f2000)

    libssl.so.1.1 => /lib/x86_64-linux-gnu/libssl.so.1.1 (0x00007f8aee45f000)

    libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f8aee3d7000)

    libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f8aee39f000)

    libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007f8aee298000)

    libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f8aee247000)

    libicui18n.so.56 => not found

    libicuuc.so.56 => not found

    libicudata.so.56 => not found

    libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f8aee240000)

    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f8aee117000)

    libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f8aee05f000)

    libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f8aee02b000)

    libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f8aedf6c000)

    libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007f8aedf3d000)

    libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f8aede8e000)

    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f8aede1b000)

    libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f8aedcde000)

    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f8aedcd3000)

    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f8aedca8000)

    liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f8aedc87000)

    libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f8aedb69000)

    libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f8aedb3f000)

    libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f8aedb1c000)

    libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f8aedb14000)

    libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f8aedb0c000)

    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f8aedaf2000)

Ouput of ldd /usr/bin/nomacs

ldd /usr/bin/nomacs

    linux-vdso.so.1 (0x00007ffd41fa6000)

    libnomacsCore.so.3 => /usr/lib/nomacs/libnomacsCore.so.3 (0x00007fd5d97ea000)

    libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fd5d95f4000)

    libQt5Widgets.so.5 => /lib/x86_64-linux-gnu/libQt5Widgets.so.5 (0x00007fd5d8f59000)

    libQt5Gui.so.5 => /lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x00007fd5d896e000)

    libQt5Core.so.5 => /lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007fd5d8178000)

    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd5d815d000)

    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd5d7f69000)

    libexiv2.so.27 => /lib/x86_64-linux-gnu/libexiv2.so.27 (0x00007fd5d7c5e000)

    libraw.so.19 => /lib/x86_64-linux-gnu/libraw.so.19 (0x00007fd5d7b7e000)

    libopencv_imgproc.so.4.2 => /lib/x86_64-linux-gnu/libopencv_imgproc.so.4.2 (0x00007fd5d75d7000)

    libtiff.so.5 => /lib/x86_64-linux-gnu/libtiff.so.5 (0x00007fd5d7556000)

    libquazip5.so.1 => /lib/x86_64-linux-gnu/libquazip5.so.1 (0x00007fd5d7523000)

    libQt5Network.so.5 => /lib/x86_64-linux-gnu/libQt5Network.so.5 (0x00007fd5d7360000)

    libQt5PrintSupport.so.5 => /lib/x86_64-linux-gnu/libQt5PrintSupport.so.5 (0x00007fd5d72e7000)

    libQt5Concurrent.so.5 => /lib/x86_64-linux-gnu/libQt5Concurrent.so.5 (0x00007fd5d72de000)

    libQt5Svg.so.5 => /lib/x86_64-linux-gnu/libQt5Svg.so.5 (0x00007fd5d7282000)

    libopencv_core.so.4.2 => /lib/x86_64-linux-gnu/libopencv_core.so.4.2 (0x00007fd5d6ed2000)

    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd5d6d83000)

    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd5d6d5e000)

    /lib64/ld-linux-x86-64.so.2 (0x00007fd5d9bd4000)

    libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007fd5d6cd6000)

    libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fd5d6c9e000)

    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd5d6c82000)

    libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007fd5d6b7d000)

    libicui18n.so.56 => not found

    libicuuc.so.56 => not found

    libicudata.so.56 => not found

    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd5d6b75000)

    libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fd5d6b70000)

    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fd5d6a47000)

    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fd5d6a17000)

    libjpeg.so.8 => /lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007fd5d6992000)

    liblcms2.so.2 => /lib/x86_64-linux-gnu/liblcms2.so.2 (0x00007fd5d6937000)

    libgomp.so.1 => /lib/x86_64-linux-gnu/libgomp.so.1 (0x00007fd5d68f5000)

    libwebp.so.6 => /lib/x86_64-linux-gnu/libwebp.so.6 (0x00007fd5d688b000)

    libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007fd5d67e0000)

    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fd5d67b7000)

    libjbig.so.0 => /lib/x86_64-linux-gnu/libjbig.so.0 (0x00007fd5d65a9000)

    libtbb.so.2 => /lib/x86_64-linux-gnu/libtbb.so.2 (0x00007fd5d6563000)

    libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fd5d64ab000)

    libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fd5d6475000)

    libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fd5d63b6000)

    libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007fd5d6389000)

    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fd5d6316000)

    libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007fd5d61d9000)

    libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fd5d61ad000)

    libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007fd5d61a7000)

    libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fd5d619f000)

    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fd5d6185000)

Output of dpkg -S $(realpath $(grep -E "/lib.*" --only-matching /tmp/not-from-apt)) 2> /tmp/not-from-apt-final for qbittorrent

libssl1.1:amd64: /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

libtorrent-rasterbar10: /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.10.0.0

libqt5widgets5:amd64: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12.8

libqt5gui5:amd64: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8

libqt5dbus5:amd64: /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5.12.8

libqt5network5:amd64: /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.12.8

libqt5xml5:amd64: /usr/lib/x86_64-linux-gnu/libQt5Xml.so.5.12.8

libqt5core5a:amd64: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.8

libstdc++6:amd64: /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.28

libssl1.1:amd64: /usr/lib/x86_64-linux-gnu/libssl.so.1.1

libgl1:amd64: /usr/lib/x86_64-linux-gnu/libGL.so.1.7.0

libpng16-16:amd64: /usr/lib/x86_64-linux-gnu/libpng16.so.16.37.0

libharfbuzz0b:amd64: /usr/lib/x86_64-linux-gnu/libharfbuzz.so.0.20600.4

libglib2.0-0:amd64: /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0.6400.6

libglib2.0-0:amd64: /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6400.6

libglvnd0:amd64: /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0.0.0

libglx0:amd64: /usr/lib/x86_64-linux-gnu/libGLX.so.0.0.0

libfreetype6:amd64: /usr/lib/x86_64-linux-gnu/libfreetype.so.6.17.1

libgraphite2-3:amd64: /usr/lib/x86_64-linux-gnu/libgraphite2.so.3.2.1

libx11-6:amd64: /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0

liblz4-1:amd64: /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.2

libgcrypt20:amd64: /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.2.5

libxcb1:amd64: /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0

libxau6:amd64: /usr/lib/x86_64-linux-gnu/libXau.so.6.0.0

libxdmcp6:amd64: /usr/lib/x86_64-linux-gnu/libXdmcp.so.6.0.0

libbsd0:amd64: /usr/lib/x86_64-linux-gnu/libbsd.so.0.10.0