Dear ChimeraX users and Developers,

ChimeraX v. 0.5 or 0.6 would not start on our stock Ubuntu 16.04 machines. The error message is as follows:

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, xcb.

Reinstalling the application may fix this problem.

Fatal Python error: Aborted

Current thread 0x000014f406ce7740 (most recent call first):

File "/usr/local/lbbs/chimerax/current/lib/python3.6/site-packages/chimerax/ui/gui.py", line 93 in __init__

File "/usr/local/lbbs/chimerax/current/lib/python3.6/site-packages/ChimeraX_main.py", line 485 in init

File "/usr/local/lbbs/chimerax/current/lib/python3.6/site-packages/ChimeraX_main.py", line 788 in <module>

File "/usr/local/lbbs/chimerax/current/lib/python3.6/runpy.py", line 85 in _run_code

File "/usr/local/lbbs/chimerax/current/lib/python3.6/runpy.py", line 193 in _run_module_as_main

Aborted (core dumped)

A few more errors while checking for missing libraries (ldd) of ChimeraX-supplied libqxcb.so, libqxcb-glx-integration.so or libqxcb-egl-integration.so

/usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.9' not found

/usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5' not found

/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: version `Qt_5_PRIVATE_API' not found

/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5: version `Qt_5' not found

/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5

Do I need to do a system-wide replacement of Qt5 for a different flavor (OpenGLES)?

Thanks,

Petr