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QXcbConnection: Could not connect to display localhost:10.0

  • Hi All,

    I'm running into a weird problem which already was discussed frequently, however my case seems to be a bit different.
    Um debugging remotely a GUI-based application running on an ARMv8 target (Dragonboard 410c) using Qt Creator on an Ubuntu 18 x86_64 machine. I set up everything for deploying and debugging remotely:

    • I set DISPLAY to localhost:10.0 (in the run environment of Qt Creator)
    • I set up a working ssh -X connection to the remote target
    • When I start the application to be debugged in the ssh -X shell everything works nicely (the application window pops up on Ubuntu machine)
    • When I even click the run button in Qt Creator also everything works perfect.
    • But: when I start to debug I get the following application output:

    qt.qpa.screen: QXcbConnection: Could not connect to display localhost:10.0
    Could not connect to any X display.
    Child exited with status 1

    Any idea?

  • I am facing the same exact behaviour, did you managed to resolve it?

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