[chimerax-users] [Chimera-users] ChimeraX won't start on Ubuntu 16.04

[Greg Couch]

(This is really a question for the chimerax-users mailing list, not the 
chimera-users one.)

If you can wait a week or so, I'll have a ChimeraX .deb package for 
Ubuntu 16.04 (and another for 18.04).

But to answer your question, you do not need a system-wide replacement 
of Qt5.  libQt5core.so.5 is in 
CHIMERAX/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Core.so.5, where 
CHIMERAX is where ChimeraX was installed.  So add that directory to the 
LD_LIBRARY_PATH environment variable and rerun ldd on libqxcb.so.  And 
please let me know what you find out so I can make sure the .deb package 
avoids that problem.

     Regards,

     Greg

On 06/21/2018 10:34 AM, Petr Leiman wrote:
> 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
>
>
> _______________________________________________
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