Running with my LD_LIBRARY_PATH setup seems to avoid the problem.
$ LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/:$LD_LIBRARY_PATH git-cola
I was lead to attempting this by post at
https://superuser.com/questions/1397366/what-is-wrong-with-my-qt-
environment-it-reports-could-not-find-or-load-the-qt/1397518#1397518
It was noticed that in my debug of the Qt plugins and dynamic library
use, multiple library paths were being selected:
$ export QT_DEBUG_PLUGINS=1
$ git-cola
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms"
...
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqeglfs.so"
Found metadata in lib
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"eglfs"
]
},
"className": "QEglFSIntegrationPlugin",
"debug": false,
"version": 329989
}
..
Got keys from plugin meta data ("xcb")
Cannot load library /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so:
(/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: symbol
_ZNK15QPlatformWindow15safeAreaMarginsEv version Qt_5_PRIVATE_API not defined
in file libQt5Gui.so.5 with link time reference)
QLibraryPrivate::loadPlugin failed on
"/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so" : "Cannot load
library /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so:
(/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: symbol
_ZNK15QPlatformWindow15safeAreaMarginsEv version Qt_5_PRIVATE_API not defined
in file libQt5Gui.so.5 with link time reference)"
This application failed to start because it could not find or load the Qt
platform plugin "xcb"
in "".
Available platform plugins are: eglfs, linuxfb, minimal, minimalegl,
offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-
xcomposite-glx, xcb.
Reinstalling the application may fix this problem.
Aborted (core dumped)
$ env LANG=C ldd /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
linux-vdso.so.1 (0x7ffc489e3000)
libQt5XcbQpa.so.5 => /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
(0x7fd3090c8000)
libQt5Gui.so.5 => /lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x7fd308919000)
libQt5Core.so.5 => /lib/x86_64-linux-gnu/libQt5Core.so.5
(0x7fd3081de000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
(0x7fd307e5)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x7fd307a5f000)
libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
(0x7fd307749000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
(0x7fd307504000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6
(0x7fd30725)
libQt5DBus.so.5 => /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
(0x7fd306fc6000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x7fd306da7000)
libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1
(0x7fd306ba5000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x7fd30686c000)
libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x7fd30665c000)
libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x7fd306454000)
libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 (0x7fd306239000)
libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1
(0x7fd30601d000)
libxcb-render-util.so.0 =>
/usr/lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x7fd305e19000)
libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0
(0x7fd305c0c000)
libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1
(0x7fd305a05000)
libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0
(0x7fd3057fd000)
libxcb-xinerama.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xinerama.so.0
(0x7fd3055fa000)
libxcb-randr.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-randr.so.0
(0x7fd3053ea000)
libxcb-image.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-image.so.0
(0x7fd3051e5000)
libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0
(0x7fd304fe2000)
libxcb-keysyms.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-keysyms.so.1
(0x7fd304ddf000)
libxcb-icccm.so.4 => /usr/lib/x86_64-linux-gnu/libxcb-icccm.so.4
(0x7fd304bda000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x7fd3049b2000)
libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0
(0x7fd3047ae000)
libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0
(0x7fd3045a6000)
libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0
(0x7fd304367000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x7fd303fc9000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x7fd303db1000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x7fd303b25000)
libz.so.1 =>
