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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

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  • A Offline
    A Offline
    actionmystique
    replied to actionmystique on last edited by
    #131

    Has anyone tried to run SeaTools from seagate on Ubuntu?

    1 Reply Last reply
    0
  • M Offline
    M Offline
    mywings19
    wrote on last edited by
    #132

    hi,
    I'm facing similar issue.could you give me some suggestion?
    my QT version is:Qt Creator 8.0.1 based on Qt 6.3.1

    the error message:
    qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" even though it was found.
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    Available platform plugins are: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.

    Then I've set 'export QT_DEBUG_PLUGINS=1'
    but there's no extra error message,qtcreator is running normally

    And I've run 'ldd libqxcb.so',result is

            linux-vdso.so.1 (0x00007ffcdb970000)
        libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6XcbQpa.so.6 (0x00007f02bc4a5000)
        libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f02bc476000)
        libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f02bc434000)
        libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f02bc42d000)
        libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f02bc427000)
        libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f02bc422000)
        libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f02bc40e000)
        libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f02bc407000)
        libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f02bc402000)
        libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f02bc3f8000)
        libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f02bc3ee000)
        libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f02bc3df000)
        libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f02bc3d8000)
        libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f02bc3ba000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f02bc390000)
        libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6OpenGL.so.6 (0x00007f02bc2ee000)
        libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Gui.so.6 (0x00007f02bb96b000)
        libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f02bb8d7000)
        libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Core.so.6 (0x00007f02bb272000)
        libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f02bb26d000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f02bb12c000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f02bb127000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f02bb106000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f02baf82000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f02badfd000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f02bade3000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f02bac22000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f02bab03000)
        libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f02baafe000)
        libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007f02baaf2000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f02baaed000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f02baae5000)
        libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f02baad0000)
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f02baa8a000)
        libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6DBus.so.6 (0x00007f02ba9b8000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f02ba99b000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f02ba8df000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f02ba8ab000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f02ba7ee000)
        libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f02ba353000)
        libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f02b9f9b000)
        libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f02b85b8000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f02b85ae000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f02bc55d000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f02b853a000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f02b8520000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f02b84e1000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f02b84d8000)
        libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f02b8485000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f02b844c000)
        libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f02b8437000)
        libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f02b8394000)
        liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f02b836c000)
        liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f02b834d000)
        libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f02b8228000)
        libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f02b8205000)

    what to do next?thank you!

    JonBJ 1 Reply Last reply
    0
  • JonBJ Offline
    JonBJ Offline
    JonB
    replied to mywings19 on last edited by
    #133

    @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

    Then I've set 'export QT_DEBUG_PLUGINS=1'
    but there's no extra error message,qtcreator is running normally

    Have you actually run whatever executable raises the error (Qt Creator itself?? Your application?) from the shell where you set this environment variable, like all the posts tell you to? Because if so you should get a whole bunch of diagnostic output lines....

    M 1 Reply Last reply
    0
  • M Offline
    M Offline
    mywings19
    replied to JonB on last edited by
    #134

    @JonB

    sugon@EC:~$ cat ~/.bashrc
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
#[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    xterm-color|*-256color) color_prompt=yes;;
esac

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
        # We have color support; assume it's compliant with Ecma-48
        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
        # a case would tend to support setf rather than setaf.)
        color_prompt=yes
    else
        color_prompt=
    fi
fi

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    #alias grep='grep --color=auto'
    #alias fgrep='fgrep --color=auto'
    #alias egrep='egrep --color=auto'
fi

# colored GCC warnings and errors
#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

# some more ls aliases
#alias ll='ls -l'
#alias la='ls -A'
#alias l='ls -CF'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi
# Set LS_COLORS environment by Deepin
if [[ ("$TERM" = *256color || "$TERM" = screen* || "$TERM" = xterm* ) && -f /etc/lscolor-256color ]]; then
    eval $(dircolors -b /etc/lscolor-256color)
else
    eval $(dircolors)
fi

export QT_DEBUG_PLUGINS=1
export QT_QPA_PLATFORM_PLUGIN_PATH=/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms
sugon@EC:~$ source ~/.bashrc
sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.

Aborded
sugon@EC:~$ ldd ~/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/libqxcb.so 
        linux-vdso.so.1 (0x00007ffeb7df5000)
        libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6XcbQpa.so.6 (0x00007fd7162df000)
        libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007fd7162b0000)
        libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007fd71626e000)
        libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007fd716267000)
        libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007fd716261000)
        libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007fd71625c000)
        libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007fd716248000)
        libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007fd716241000)
        libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fd71623c000)
        libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fd716232000)
        libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fd716228000)
        libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fd716219000)
        libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fd716212000)
        libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007fd7161f4000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fd7161ca000)
        libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6OpenGL.so.6 (0x00007fd716128000)
        libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007fd7157a5000)
        libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007fd715711000)
        libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007fd7150ac000)
        libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fd7150a7000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007fd714f66000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd714f61000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd714f40000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fd714dbc000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd714c37000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd714c1d000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd714a5c000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fd71493d000)
        libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fd714938000)
        libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007fd71492c000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007fd714927000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fd71491f000)
        libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007fd71490a000)
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007fd7148c4000)
        libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007fd7147f2000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd7147d5000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fd714719000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fd7146e5000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fd714628000)
        libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicui18n.so.56 (0x00007fd71418d000)
        libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicuuc.so.56 (0x00007fd713dd5000)
        libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicudata.so.56 (0x00007fd7123f2000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fd7123e8000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fd716397000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fd712374000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fd71235a000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fd71231b000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fd712312000)
        libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007fd7122bf000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fd712286000)
        libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007fd712271000)
        libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fd7121ce000)
        liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fd7121a6000)
        liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007fd712187000)
        libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007fd712062000)
        libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007fd71203f000)
sugon@EC:~$
    1 Reply Last reply
    0
  • SGaistS Offline
    SGaistS Offline
    SGaist Lifetime Qt Champion
    wrote on last edited by
    #135

    Hi,

    Why are you pointing the plugin path to Qt Creator's installation rather than the Qt version you used to build your application ?

    By default you should not even need to use that variable.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    M 1 Reply Last reply
    0
  • M Offline
    M Offline
    mywings19
    replied to SGaist on last edited by
    #136

    @SGaist
    Me?That might be the problem

    When I point the Qt plugin path, 'xcb' couldn't be found
    sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
    qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    Available platform plugins are: linuxfb, minimal, offscreen, vnc.

    So shall I reinstall the Qt or add some plugins?
    Thank you

    1 Reply Last reply
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  • SGaistS Offline
    SGaistS Offline
    SGaist Lifetime Qt Champion
    wrote on last edited by
    #137

    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

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    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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  • M Offline
    M Offline
    mywings19
    replied to SGaist on last edited by mywings19
    #138

    @SGaist said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

    I've set the QT_DEBUG_PLUGINS environment variable in the .bashrc file and sourced it. See floor.134
    But these is no error message while loading qtcreator.

    sugon@EC:~$ echo $QT_DEBUG_PLUGINS
    1
    sugon@EC:~$

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  • hskoglundH Offline
    hskoglundH Offline
    hskoglund
    wrote on last edited by
    #139

    Hi, perhaps you are launching Qt Creator by double clicking on it?
    If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

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  • M Offline
    M Offline
    mywings19
    replied to hskoglund on last edited by
    #140

    @hskoglund said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

    Hi, perhaps you are launching Qt Creator by double clicking on it?
    If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

    Thank you, but I always start qtcreator in terminal. It can be seen in floor.134

    sugon@EC:~$ source ~/.bashrc
    sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
    sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test

    There's no error message until I closed the software.

    JonBJ 1 Reply Last reply
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  • JonBJ Offline
    JonBJ Offline
    JonB
    replied to mywings19 on last edited by
    #141

    @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

    There's no error message until I closed the software.

    In that case when does the message you showed earlier:

    qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: linuxfb, minimal, offscreen, vnc.

    appear? Not until after you close Creator? Interesting.....

    M 1 Reply Last reply
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  • M Offline
    M Offline
    mywings19
    replied to JonB on last edited by mywings19
    #142

    @JonB said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

    @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

    There's no error message until I closed the software.

    In that case when does the message you showed earlier:

    qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: linuxfb, minimal, offscreen, vnc.

    appear? Not until after you close Creator? Interesting.....

    This 3 line message is showed when I build and run a test project.
    I mean after I set QT_DEBUG_PLUGINS to 1, There's no extra error message except this 3 line when I start qtcreator or run project in terminal.

    Now, I've uninstall the Qt and qtcreator,then installing by online installer.

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  • SGaistS Offline
    SGaistS Offline
    SGaist Lifetime Qt Champion
    wrote on last edited by
    #143

    Is that a custom Qt build ? Because from the looks of it, the plugin is indeed not there.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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  • B Offline
    B Offline
    BenyaminZojaji
    wrote on last edited by
    #144

    In my case, I just upgrade PyQt5 to PyQt6 and that works.

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  • G Offline
    G Offline
    GEZawaTT
    replied to trimixotun on last edited by
    #145

    @trimixotun this worked!! Thank you so much!

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  • 3 Offline
    3 Offline
    3mad
    wrote on last edited by
    #146

    In my case, I had the issue when installing ParaView, things fixed by installing the libxcb-xinput0 package:
    sudo apt-get install libxcb-xinput0

    Then, things work fine.

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  • R Offline
    R Offline
    roux.benoit
    wrote on last edited by
    #147

    Hi,

    I know this is an old post, but I have the same issue that comes up when I'm setting some path for the LD_Library_path.

    for the context i'm creating a container that run an app with a gui using pyqt5, which works perfectly.

    However, I also need to install matlab runtime and after I set up Matlab runtime environement path :

    LD_LIBRARY_PATH=/opt/mscr/v912/runtime/glnxa64:/opt/mcr/v912/bin/glnxa64:/opt/mcr/v912/sys/os/glnxa64:/opt/mcr/v912/sys/opengl/lib/glnxa64

    the gui stops working and I get the "qt.qpa.plugin ..." error message.

    Any thoughts?
    Thanks a lot

    SGaistS 1 Reply Last reply
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  • SGaistS Offline
    SGaistS Offline
    SGaist Lifetime Qt Champion
    replied to roux.benoit on last edited by
    #148

    @roux-benoit hi,

    Check whether there's Qt libraries in your matlab installation.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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  • P Offline
    P Offline
    phil-lipp
    wrote on last edited by
    #149

    I hope someone on this forum can help me. I'm trying to use Howdy (https://github.com/boltgolt/howdy), but I get the error described by OP.
    I only get the error when I use su -, however when I use plain su (without the -) it works. So I think i somehow messed up the install when I forgot to add the -... how can I fix this?

    the error:

    qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
``
    JonBJ 1 Reply Last reply
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  • JonBJ Offline
    JonBJ Offline
    JonB
    replied to phil-lipp on last edited by
    #150

    @phil-lipp
    https://forum.qt.io/post/763171 was just asked.

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