MATLAB Answers

Could not find or load the Qt platform plugin "xcb".

96 views (last 30 days)
M on 9 Oct 2017
Commented: Knut Jørgen on 29 Apr 2021
I am trying to launch an executable from Matlab.
I am using Matlab 2017b and Ubuntu 16.04 and this executable file has been compiled with ubuntu too.
When I launch this file from a terminal
it works fine but when I launch it from Matlab I get this error :
[status, out]=system('./myExe')
status = 134
out = This application failed to start because it could not find or load the Qt platform plugin "xcb".
but I have not been able to make it work.
Thank you for any help you could provide.

Accepted Answer

Carl on 11 Oct 2017
Try the steps below and see if they solve the issue:
1) Check whether the environment variables are the same when running from the terminal vs running from MATLAB. You can use the printenv or env commands (and use the system function to call them within MATLAB). In particular, look for the value of the PATH and LD_LIBRARY_PATH variables. Make sure that the necessary libraries on the terminal paths are available from MATLAB as well.
2) Try the following steps:
  • Identify the location where MATLAB is installed
  • Navigate to the sys/os/glnxa64 directory within this installation folder
  • Rename library to
3) If you know where your QT installation is, you can try setting the following environment variable:
$ export QT_PLUGIN_PATH=<qt_base_path>/plugins

More Answers (1)

M on 16 Oct 2017
Edited: M on 7 Feb 2018
Thanks for your answer.
I got the same PATH from the terminal and from Matlab but on the linux terminal I don't have any "LD_LIBRARY_PATH" entry.
Is this the problem ?
EDIT : With a new installation of QT and Matlab, I am able to fix the problem using "LD_LIBRARY_PATH".
Knut Jørgen
Knut Jørgen on 29 Apr 2021
I too have this problem. It is present with Matlab 2021a and I am using freeview from fressurfer.

Sign in to comment.


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by