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Questions tagged [qt]

Qt is an application and UI framework. The K Desktop Environment is based on QT.

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PDF reader with thumbnail preview in the opening dialog

Situation: I download lots of PDFs which have unhelpful file names, such as arXiv papers (thanks, 1807.03042.pdf). I'm often reading one of them in Okular and want to switch to another, say just to ...
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shared library not found even if "export LD_LIBRARY_PATH" is set

Here comes a strange question. I have a QT App and it requires some libraries. Normally, the following bash script works: #!/bin/bash export LD_LIBRARY_PATH="./libs" export QT_DEBUG_PLUGINS=...
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Bad font antialiasing for Qt6 applications

Environment: OS: Fedora 36 DE: XFCE Font: Windows Tahoma Font config $XDG_CURRENT_DESKTOP=XFCE Qt6-6.2.3-2.fc36 Problem: Qt6 applications seemingly do not use my fontconfig settings (which are used ...
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2 votes
1 answer
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Existing .so file cannot be loaded even though it exists, seems to depend on Docker host OS

I have built Qt6 in an Alma8 based Docker container, with the Docker host being Fedora 35. Under some circumstances (described below), all Qt libs cannot load libQt6Core.so[.6[.2.4]]. But that file ...
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If it is possible to track the "text input state" system-wide? How?

Is it possible to track that system is currently in "text-input state" := when the window that has text input field (or "text input possibility" to be more general) is open now and ...
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Audio in Qt6 application does not work if run from cron of systemd

Ubuntu 21.10, Qt 6.2.0. In my QML I have a MediaPlayer: MediaPlayer { id: mediaPlayer videoOutput: videoOutput audioOutput: audioOutput onErrorOccurred: { console.log(mediaPlayer....
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Enable hw acceleration for Intel HD 500

With Ubuntu 20.04 and Qt 6.2.0 I was able to play mp4 videos with hardware acceleration using QtMultimedia: MediaPlayer { id: mediaBackground videoOutput: videoOutput ...
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1 answer
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TCL - Error in startup script: expected integer but got "Sans"

I am trying to run a tcl script using wish as $ wish main.tcl output of the command is Error in startup script: expected integer but got "Sans" (database entry for "-font" in ...
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190 views

Maximum number of clients reachedqt.qpa.xcb: could not connect to display :0

I am using Linux Mint 20.1 Cinnamon with kernel version 5.4.0-97-generic. I am facing recent issue when try to open okular from terminal or start-menu.. Maximum number of clients reachedqt.qpa.xcb: ...
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303 views

How to change Qt/Gtk theme using CLI

I can change the theme using lxappearance and everything works. This includes pcmanfm, gnome-disks, firefox, and qalculate-qt themes being changed. Using gsettings set org.gnome.desktop.interface ...
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Inputing accented letters in Qt applications on Cygwin

I am a native Portuguese speaker, and I am having problems when typing accented characters in any Qt application running on Cygwin. Almost always, the result on the screen for any accented letter I ...
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CMake error "Could not find a package configuration file provided by "Qt5QuickControls2""

I'm trying to build the vvave music player on Debian11/KDE but running cmake .. fails - it shows this error: -- The CXX compiler identification is unknown CMake Error at CMakeLists.txt:23 (project): ...
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2 answers
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ImportError /usr/lib64/libQt5Core.so.5 - in several software packages

Working with Fedora 35: I want to run a few different software packages that share a dependency, seemingly Qt. In the shell, I get this response, from Cadence and other software: ImportError: /...
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How to add QT_QPA_PLATFORMTHEME=qt5ct environment variable in Arch Linux?

I am using a standalone tiling window manager QTile. In QTile I want to organize my GTK and QT Themes. For GTK theme I used a program named "lzappearance" and it works perfectly fine. But, ...
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233 views

E: Unable to correct problems, you have held broken packages. (Debian 9.13)

To install Qt on a motherboard I need to download several packages, but every time I get this error in the libxi-dev package. I tried to download the dependencies separately but it still didn't work. ...
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How to configure Qt base GUI interface in Linux Debian 11

I would like to use my PC to mine Raptoreum coin I visited the project site https://raptoreum.com/ and downloaded their wallet when I start my wallet by executing the qt extension the Wallet starts ...
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i3 GTK & Qt theming problem

Applications that use Qt and GTK look different how can I fix this, i’m using i3 is there any software to theme Qt? PS: I’ve heard about lxappearance but it only works for GTK
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how to change scrollbar width in KDE (QT) apps?

i'm trying to change the width of the scroll bars in KDE apps (like konsole), and it is my understanding that i have to change a qt setting or something, but i'm not finding any clear answers on how ...
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qt5ct not saving font changes after close

i'm attempting to change the default font of KDE apps using qt5ct. however, the app will not save my changes once it closes. what will happen is i'll apply the font change, and all the KDE apps will ...
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1 vote
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592 views

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" on arch linux

I'am currently trying to get some images outputted after running this code: import cv2 as cv import matplotlib.pyplot as plt img = cv.imread('Photos/cat.jpg') cv.imshow('cat', img) plt.imshow(img) ...
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qt5 program with "-platform linuxfb" does not reset framebuffer when crashing

We have a qt5 program running under Alpine Linux v3.14 which uses a fragile legacy library which may cause the entire program to crash. Alpine Linux switches to framebuffer mode during start up. We ...
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2 answers
261 views

Install qt3 on Centos 8

I was able to download the qt3 yum package wget http://mirror.centos.org/centos/7/os/x86_64/Packages/qt3-devel-3.3.8b-51.el7.x86_64.rpm but there were some dependencies missing when installing ...
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TeXStudio Dependancy issues - Ubuntu

I was trying to install tex studio using sudo apt install texstudio But some dependencies are missing here. I understand that they are primarily the Qt libraries. I tried to install from qt website ...
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131 views

Programmatically Trigger Drag&Drop Events on Linux

I currently working on an interactive video stream application (implemented in PyQt5) which allows viewers of the stream to interact with the streamer's system, for example by moving the mouse cursor ...
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Diagnosing cause of a process using 100% CPU

I'm trying to diagnose a strange error occurring on a fairly stripped-down Celeron N2930 (quad core Atom) PC running a Qt Quick based Application on top of Debian 10 Linux 32-bit (think basically a ...
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Can't change Qt version from 5.12.8 to 5.15.X

I've tried building packages from qt's website but everytime I try to cmake a specific file that requests qt version 5.15 I'm always told it fails because I'm using the default version 5.12.8. How can ...
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1 vote
1 answer
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Weird graphical effects on colored text with asus eeepc

I have an old Asus eeePC 1000H netbook with a weird graphical bug in the window-manager. 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics ...
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How do I make qmake do various kinds of builds?

I've been using CMake for many years to build C++ projects, some of which use Qt, and I have a shell script called build which creates several build directories. I need to build a huge project with ...
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1 vote
1 answer
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xdotool - Qt: failed to retrieve the virtual modifier names from XKB

I seem to be unable to make xdotool work. I'm trying to emulate keyboard shortcuts as Super+Left via external output. I looked it up and xdotool seems to do exactly that, emulate keyboard strokes. But ...
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107 views

Matlab QT libraries prevent programs from running

I have matlab on my machine with Compiler toolbox. In order for compiler code to work, it needs access to libraries. They are supposed to be saved in LD_LIBRARY_PATH So I adjusted my .bashrc to ...
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Overriding the custom style on a proprietary Qt5 application

I'm running KDE Plasma 5.22 on Gentoo using Kvantum for my application theme engine. I'd like to use the application Chaotica, which is a fractal rendering suite that is far superior to most others, ...
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1 vote
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1k views

QStandardPaths: wrong ownership on runtime directory when trying to install a program

I am trying to install antidote for spellchecking my thesis. I am on debian stretch: 4.9.0-15-amd64 #1 SMP Debian 4.9.258-1 (2021-03-08) x86_64 GNU/Linux I suscribed to free trial, downloaded the ...
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  • 113
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How can I force Qt5 built applications to "Center New Windows" under GNOME 3.30.2?

I'm on Debian 10 with GNOME 3.30.2, and my setup is set to open all new windows on the center of the screen. This is done via the Tweaks Tool with the option "Center New Windows". I noticed ...
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1 vote
1 answer
216 views

not finding icons in dolphin in pop os 20.04

I have installed dolphin of KDE in pop os. But I found that folder icons and back forward icons were not showing in that file manager. Looking for the solution, I found that installing qt5ct and then ...
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Texmaker open file interface garbled

I have a problem when using Texmaker. When I use Texmaker to open a file, its user interfaces garbled. My OS is archlinux. I have tried system update and software reinstallation. It doesn't help. I ...
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1 answer
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Alsa-lib kernel options

I'm installing Qt to install KDE on my VMware LFS virtual machine. The BLFS guide says to do some kernel configurations appropriate for the hardware, but I don't know what things should I enable and ...
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How to get Qt creator running on a fresh system?

I'm trying to install the Qt development environment on a fresh Debian, without success. First, the automatic online installer didn't even manage to get me to a usable state, as the xserver was ...
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After an update, cannot launch any graphical application

After updating my Artix/Arch Linux distribution with: sudo pacman -Syu this is what happens: I boot the system. I log in with KDE environment. All the default graphical applications start correctly ...
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1 answer
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How to install python libraries via apt for non-apt version of python?

I'm running Debian on a Beaglebone which uses ARM architecture. The distribution has python 3.5, but one of my dependencies, aioserial, requires 3.6. I built python 3.6 from source to the /opt/python-...
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Fix HP printer software after upgrade (on Arch Linux)

I am trying to run HP's printer software which was upgraded recently and broke all my printing. I run a constantly upgraded Arch (which is 5.10.14 as of Feb 28, 2021). Apparently they use Qt now so it ...
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1 vote
1 answer
102 views

Making Linux program working for the next 50 years? [closed]

I have a program running on Ubuntu 16.04 LTS, which is EOL in 2 months. The program is a Python 2 app using QT4. It works perfectly and I want to move it to Ubuntu 20. Not so fast, both Python2 and ...
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1 answer
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xhost: unable to open display "desktop:0"

UPDATE 1: I am not using SSH. I am using a local machine. UPDATE 2: I restarted the X and notice that the Xauthority file that I am exporting to is actually being updated: $ sudo systemctl restart ...
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1 vote
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what are the leftovers from the previous builds of Qt?

it's been a while that I am trying to cross compile Qt for my Raspberry pi 4 on a lite version of OS (that has no desktop, no x server ..) on my Ubuntu 18.04 I tried many times and I changed the ...
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transmission-qt only run on KDE Plasma

Transmission daemon 2.94-2 (like previous releases) has been working fine on Debian Buster, along with Transmission Web Interface, but not with transmission-gtk and transmission-qt clients, outside ...
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Kit Scenarist is not installing in Debian-testing

sudo apt install kitscenarist Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an ...
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611 views

Cannot mix incompatible Qt library (5.14.2) with this library (5.15.1) in debian bullseye

I can't launch any program that uses Qt since I copied some gl.so manually and/or updated debian bullseye... I don't know. user@desktop:~$ vlc VLC media player 3.0.11.1 Vetinari (revision 3.0.11.1-0-...
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100 views

KDE black screen after login, problem with Qt libraries

I am using a clean OpenSUSE Leap 15.2 installation with KDE. I installed a list of packages for an application I am developing which require a number of Qt5 libraries, and for it to work, I have to ...
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1 answer
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Qt closes immediatly when importing uia model

I have installed Qt 5.15.1 recently (full framework). I could not import Qt 3D presentation to a Qt design studio or Qt Creator (Qt Quick 2) projects. When importing via library->Assets->Add New ...
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108 views

Kill all processes that are using qt5

I would like to run a python script with conflicts with the use of a certain graphical framework: ImportError: Cannot load backend 'TkAgg' which requires the 'tk' interactive framework, as 'qt5' is ...
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2 votes
3 answers
2k views

Where is the system-wide dark mode setting in Linux?

I'm using the Raspberry Pi version of Debian, which has both GTK and KDE programs, as well as bygone era programs like xpdf that still work just fine. If I wanted to tell apps that I prefer Dark Mode, ...
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