Questions tagged [qt]

Qt is an application framework originally created by Trolltech and currently managed by Digia. The KDE desktop uses the Qt framework for its applications.

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How to make a graphical interface in Qt with a list of online players, and when I click on a player to send him a game start request.?

You can give me a repository github that can help me? I need for a game Bomberman online in qt.
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Creating a Debian package for a Qt application built using CMake

I would like to create a .deb installation package for a GUI based Qt5 application. Most of the links available for this problem are pretty old, so I'm curious if there are more up-to-date solutions ...
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qt5-default not in Ubuntu 21.04

I tried to install qt5-default but the package was not found. Of course, I read this question and added universe to the apt and done a apt update. I think qt5-default is not in 21.04 yet as it says ...
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mininet wireshark qt.qpa.plugin: could not load the qt platform plugin “xcb” in “” even though it was found

Is there any relatively easy way to deal with this, except the github solution, which i already tried.
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Some confusion with conda / pip installations of PyQt5 on my Ubuntu 20.04

Context I wanted to install PyQt5 in my conda base environment, along with some other libraries. I have completed this task in different sessions. The problem is that when I went in Visual Studio Code ...
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How to include a default color scheme in a snap wrapper virtual container?

This snap wrapper for qtiplot works correctly with Breeze Light color scheme but it does not work properly with Breeze Dark (kde plasma 5.21.4): titles not appearing equations are not visible on ...
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1answer
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Lubuntu 20.04 windows too big for the screen

I've had a problem with recent installs of Lubuntu 20.04 on laptops with lower resolution screens. Specifically 2 laptops both with screens 1366 x 768 pixels. One is an Acer with stock Intel graphics ...
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x2go / x2godesktopsharing shows qt.qpa.xcb: could not connect to display / Mate desktop

I have an issue with x2go using Qt, which is a remote control program, as VNC, Teamviewer, ... I have 3 computers named like this (to explain) : Computer A : at home, computer as host for VMs. It is ...
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1answer
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Where did QT install to?

I am trying to set up a qt project in CLION. I installed qt using these commands sudo apt-get install qtcreator and sudo apt-get install qtdeclarative5-dev When you create a qt application in clion ...
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Calibre 5.14 on Ubuntu 20.04 with Python 3 has stopped working

When I run calibre I get this message: 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 ...
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810 views

Couldn't start the android-emulator for armv8-aarch64 and armv7 architectures

I have the following error On running Android emulator with armv8-aarch64 and armv7 architectures. cannot add library /home/asmmo/Android/Sdk/emulator/qemu/linux-x86_64/lib64/vulkan/libvulkan.so: ...
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How can I debug gtk file-chooser widget used from a QtQuick application?

I have issues with the file-chooser native window dialog that become unresponsive in some conditions in my app. I would like to see what the file-chooser is logging and where are the settings linked ...
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Qt5 installer does not find debugger

I installed Qt5.15.2 with the online community-version installer on Ubuntu 20.04. In QtCreator I find the compilers but not the debugger. On my system I also have GDB: $apt policy gdb gdb: Installed:...
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Cmake and Qt error when compiling

I hope this is not a duplicate. I am trying to compile a program (Kid3) on Ubuntu 20.04. When I run cmake command I get the below error: CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Qt5/Qt5Config....
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1answer
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QMake pointing to wrong directory

I am trying to build cpp project that has is dependent from Qt. I have installed the Qt in the folder opt. The Qt home directory is: /opt/Qt/5.9.9/gcc_64 The qmake executable is located in the ...
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1answer
42 views

How can I make PCManFM-Qt File Manager Open Files with a Double Click?

I'm running Lubuntu 20.10 with PCManFM-Qt 0.15.0. I have configured this file manager to open files with a double click. Edit > Preferences > Behavior > Browsing > Open files with single ...
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Cursor style is changing in QT apps!

I have set a cursor style in Ubuntu to a specific cursor design that I like. The problem is that in every QT app it uses a QT cursor! Is there a possible way to change the cursor in the QT apps to my ...
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Uninstalling Qt5

I wanted to uninstall qt and i run the necessary command like : $ sudo apt-get remove --auto-remove qt5-default and i got this answer : Reading package lists... Done Building dependency tree ...
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1answer
813 views

Cmake error: — Configuring incomplete, errors occurred!

I have an error when I run cmake ... Could you please help me? Thanks so much I want to build my project. I use mkdir build, cd build/ and cmake ...Then I got this error: CMake Error at /usr/share/...
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qt3dwindow.h missing in focal and xenial

The way dev package for Qt are designed in ubuntu is extremly disturbing to me. Lets take a simple example, QForwardRenderer include file for instance: It is part of bionic: https://packages.ubuntu....
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gnome-session-quit makes qt / kde applications crash

Ubuntu 20.10, Groovy Gorilla, gnome 3.38. When I launch gnome-session-quit using shortcut or by cli, KDE / QT applications crash. I have tested kdenlive, kvantummanger, copyq. The following is ...
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1answer
166 views

Why does Kate not work with Ubuntu 20.04

I use Ubuntu 20.04.1.; Kate 20.04.0 was installed with sudo snap install kate When I start Kate I get first the message Qt: Session management error: Could not open network socket and then pages of ...
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1answer
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qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found. in ubuntu 20.04

How should I solve this problem in Ubuntu 20.04? Invalid MIT-MAGIC-COOKIE-1 keyqt.qpa.xcb: could not connect to display :0 qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "...
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1answer
107 views

Where do I find llvm for compiling Qt documentation

Note: To build qdoc and Qt documentation in future you should set LLVM_INSTALL_DIR environment >variable pointing to directory where LLVM is installed (it should be top level directory, the >...
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1answer
560 views

How to install libQt5Quick.so.5 and other QtQuick dependencies on Ubuntu?

I'm trying to run an executable but it has some missing dependencies to QtQuick libraries: ldd ./UltraNoteInfinity ./UltraNoteInfinity: /lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.14' not ...
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1answer
456 views

Ubuntu 20.04 Deemix launching error

I get the following error when I try to open an executable file with ./deemix-pyweb: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. This ...
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Set QT variables for specific Applications

I'm using Kubuntu 20.10 (KDE Plasma) with LibreOffice 7.0.3.1. In libreoffice there are some visual glitches that seem to be related to the global UI scaling. After scrolling thru the internet I fund ...
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1answer
103 views

Qt Upgrade Problems, Cmake still looking in /usr/lib/x86_64-linux-gnu

I think I'm missing some basic understanding of how to appropriately upgrade Qt via a .run file from qt.io, and how to reference it appropriately when trying to build some code with CMake. Here's what ...
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Segfault launching Okular snap

I'm using Ubuntu 18.04.5 on x64 PC. Packaged version of Okular is too ancient for my needs, so I installed the newest Okular snap. Unfortunately, it crashes on launch. Here is the log: paul@extra:~$ ...
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42 views

toolchain.prf:73: error: Cannot write cache file /usr/lib/x86_64-linux-gnu/qt5/examples/widgets/…Permission denied

I face a problem as soon as I compile any example using Qt Creator 4.11.0 Based on Qt 5.12.8 (GCC 9.3.0, 64 bit) over Ubuntu 20.04.1 LTS
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1answer
74 views

Software Updater update failed [duplicate]

When I'm trying to update all packages in my environment, using GUI or from terminal by : sudo apt-get update I get : It simple says : ... Err:19 http://ppa.launchpad.net/beineri/opt-qt-5.11.1-...
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239 views

Best way to run a touchscreen app in kiosk mode on Ubuntu 20.04?

I'm an embedded dev who switched from weak ARM to powerful Intel Atom hardware, dedicated for running a touchscreen Qt app. I decided to stop bothering with custom Busybox OS images and use a minimal ...
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1answer
141 views

qtcreator doesn't launch on ubunu 20.04

I don't know why it doesn't launch. The last time I used it, it was perfect. I tried to run it using the terminal, then it gives: Bus error (core dumped) I tried to update and upgrade, then tried to ...
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1answer
220 views

How do I open .qch files?

I've installed the qt5-doc package but I'm not able to open the .qch files that I find in the /usr/share/qt5/doc/ directory. Do you know how I can do this? I've tried using qt5-assistant like this: ...
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3answers
518 views

Official .deb WPS Office very slow in opening file - snap version fixes the problem - Why?

I have installed WPS Office ver. 11.1.0.9719 from official website and official .deb x86_64 package. This version of WPS Office is very slow in opening some files. For example, I have this .docx file ...
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0answers
242 views

Error while running Qt application with wayland

I am trying to run a simple Qt application Hello World on Ubuntu 18.04 desktop with Wayland. Following commands, I tried. $ export QT_QPA_PLATFORM=wayland $ ./qello also tried with following command $ ...
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I have an error when loading lock screen theme when starting Kubuntu

When I select a theme on Kubuntu, it's apply the theme but after restarting Kubuntu and loading the lock this error appear: I already tried the other themes, but it still didn't work even after I ...
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24 views

what happens when we do MAKE after installing the software

I cross compiled Qt for my raspberry but I have some problems so I want to reconfigure Qt and do again make -j8 make install I want to know what happens if I do this? I am new to Linux, does it ...
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48 views

How to remove Qt on ubuntu and raspberry (after cross compilation)

I just cross compiled QT on ubuntu for my raspberry https://github.com/PhysicsX/QTonRaspberryPi/blob/main/qt5.14.2onRaspberrypi this is the code that I followed. I think that I did something wrong ...
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557 views

Shared library not found for PyQt5: libxcb-xinerama.so.0 => not found

I am setting up a python3 virtual environment for my development, so I am staying away from the package manager apt-install $ python3 -m venv . # create my environment in my working directory I then ...
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1answer
345 views

GTK theme does not work properly on Qt Startup Applications

Setup When a Qt app (KeePassXC, AntiMicroX) is started automatically (via autostart), the GTK theme is not applied. All apps are installed via standard apt packages (I am aware of snap theming issues)...
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Sometimes can't move QT based apps windows by dragging title bars

I'm on 20.04 LTS, using vanilla gnome shell and using Xorg. I've noticed that sometimes certain apps' titlebars become unresponsive to clicks/drags. The window's there and the app works just fine, but ...
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ubuntu 20.04: ibus candidate dialog does not follow cursor in qt application

I am typing Chinese with ibus in wps-office, but the candidate dialog does not follow with the cursor and always show at the left bottom corner of the window. I find the solution in ubuntu 18.04, ...
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2answers
874 views

How to update qt version to 5.15.1

i have on kubuntu qt version to 5.12.8, and i need to update it to 5.15.1 i tried to manually install it..the installation folder installs it in /home/Qt. but when i check the qt version is still 5.12....
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Matplotlib stopped working after installing after installing pyqt5==5.14.0

0 I have accidentally installed pyqt5==5.14.0 for testing for pandasGUI as seen in a tutorial in my ubuntu system. However, now i am unable to plot any graphs using matplotlib as it shows error as &...
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1answer
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Making deb with bzr: QApplication dependency

I'm trying to package a Qt 5.x application as described in https://packaging.ubuntu.com/html/packaging-new-software.html My Build-Depends in debian/control file are: debhelper-compat (= 13), ...
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How to build VirtualBox from source?

Hi I am trying to build virtualbox from source on ubuntu 16.04.1 LTS i386 using this link build from here. I installed all the packages but when I run command ./configure --disable-hardening during ...
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qt5 not found in ubuntu 16.04

hi i am trying to build virtualbox from its source code when i run ./configure it throw me this error * qt5 not found! Check /home/salman/vbox/configure.log for details even i install the qt5-default ...
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2answers
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QT Apps like GRSYNC and VLC starts slowly on Ubuntu 20.4 (since some time)

i'm on Ubuntustudio 20.4 and i'm using grsync to backup my data. This was working fine since I installed Ubuntu, but now grsync takes over 30s to start. I tried via the terminal and from the start ...
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1answer
253 views

Lyx isn't working (probably related to Qt5)

Lyx won't launch. The only error message it gives me is: lyx: symbol lookup error: lyx: undefined symbol: _ZN17QAbstractItemView11eventFilterEP7QObjectP6QEvent, version Qt_5 Lyx has been taking my ...

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