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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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KDE applications configuration - how do they do it?

I've been tackling a project more seriously lately, a project that probably every Linux dev goes through at some point - dotfiles management. KDE (and it's applications) has a history of resisting ...
dotconfig's user avatar
0 votes
1 answer
125 views

Installing libqt4-dev in Debian GNU/Linux 12 (bookworm)

I need Qt 4 for installing a software in debian bookworm. I believe I can install Qt 4 by 'sudo apt install libqt4-dev'. I wanted to know if there are any risks to it. I don't think that would be the ...
physu's user avatar
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Remote control and display of embedded Linux devices

Background information - We have two custom embedded Linux devices that both contain their own GUI for operating and controlling each device and it's software/firmware. The devices are class 2 medical ...
Dheitkamp96's user avatar
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1 answer
83 views

Running commands using sudo from within a program

I have a c++ qt program (lets call it test_program to make it easier to refer) which runs sudo lsblk using popen and prints the output. When I run the test_program from within the qt application (the ...
yash's user avatar
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75 views

Trouble using a Qt 6 application on an older (SLES 15) machine

I'm trying to run an app which apparently uses some Qt6 capabilities on my SLES 15 SP5. When I do that, I get the following error message: qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is ...
einpoklum's user avatar
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1 answer
169 views

CMake build can't find Qt6 library in /usr/local

I have an Orange Pi 5, an arm64 SBC running Joshua Riek's Ubuntu 22.04.4 for RK3588 (link to project). I'm trying to build Duckstation, a PS1 emulator, which depends on Qt 6.6.2. The latest arm64 Qt ...
eeliale's user avatar
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17 views

My embedded application doesn't receive keyboard events (Linux framebuffer/Qt+QML application/systemd service/VNC server)

I need to remotely control a Qt / QML application on an embedded ARM instrument. I intended to do that using VNC. This doesn't work. An USB keyboard plugged in the instrument doesn't work either. NB: ...
Jean-Loup Sabatier's user avatar
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./Car: error while loading shared libraries: /opt/opencv/lib/libopencv_core.so: internal error

I am in the ubuntu server cross-compiled QT program, in the compilation project, and there is no error, but I am in the cross-compiled program transplanted to ARM, prompting an error The file ...
strong zhy's user avatar
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19 views

Do GTK API calls translate to Qt commands on KDE?

AFAIK latest GTK has multiple rendering engines (Cairo, OpenGL, Vulkan...). Now on KDE (which uses Qt and not GTK) when I run a GTK program does it translate GTK API calls to Qt calls? Or does GTK ...
zomega's user avatar
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Arch linux: QT apps crash on launch: qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""

When I try to launch some QT apps I get this message: qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in "" This application failed to start because no Qt platform ...
Jan Černý's user avatar
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821 views

Installing Qt 6 on CentOS 7

I need to install Qt 6 development files to build a third-party application in CentOS 7. I have been informed that the following packages are required on Ubuntu 22.04 LTS: qt6-base-dev qt6-tools-dev ...
yildizabdullah's user avatar
0 votes
1 answer
621 views

Configure Qt darkmode

After upgrading from Fedora 37 to 39 Qt applications such as vlc aren't rendered in dark mode anymore, when starting them from a dark-mode-configured gnome shell session. Apparently, Qt application ...
maxschlepzig's user avatar
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1 answer
441 views

Problems installing QT online installer in Rhel 7

Relatively new to linux. I'm trying to run the qt online installer on a rhel 7 machine. Version info: [root@localhost Downloads]# hostnamectl Static hostname: localhost.localdomain Icon ...
PersonalComputer's user avatar
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1 answer
46 views

QT Linguist tool not picking up right translation

I am trying to use Translation feature in QT. There are more than 4000 translation needed to be done for one language. And I have to do this for more than 15 different languages. So, I decide to write ...
tabish's user avatar
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0 answers
684 views

telegram-desktop: qt.svg: Error while inflating gzip file: SVG format check failed

I use telegram-desktop on arch linux in sway. It sometimes crashes, so I started it from terminal. This way I find out telegram spams this message: qt.svg: Error while inflating gzip file: SVG format ...
Jan Černý's user avatar
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1 answer
87 views

How to Fix Qt Custom Terminal Prompt Messy Codes Problem

I made a terminal by binding bash with QProcess: // c++ in Qt4.8.7 on CentOS7 process_ptr->start("bash -i", QIODevice::ReadWrite | QIODevice::Append); // With the "-i" option, ...
Qipa's user avatar
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1 answer
106 views

How to use QtStateMachine on Arch?

I want to use QtStateMachine in one of my projects. But I fail to find the right package to install it. There is a package qt6-examples, which provides example code for the QtStateMachine module, but ...
pasbi's user avatar
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2 votes
0 answers
195 views

auto-patchelf could not satisfy dependency libQt5SerialPort.so.5

I am trying to run Qt Design Studio 2.3.1 Community on NixOS. My nix derivation code: flake.nix: { description = "Qt Design Studio"; inputs = { nixpkgs.url = "github:NixOS/...
satk0's user avatar
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487 views

Run QT gui application via SUDO Wayland

I am running wayland (riverwm) in Void linux, and trying to use rpi-imager. rpi-imager fails to write to device because it requires sudo permissions. I then try to run rpi-imager with sudo but get the ...
Guilty's user avatar
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1 answer
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GUI apps using Qt seg-fault, think wrong path is being checked?

I cannot open any of my Ubuntu 22.04 apps which use the Qt library (Konsole, P4V, Wireshark etc). They immediately seg-fault. When I start Konsole with debug logging I can see it's trying to find ...
intrigued_66's user avatar
1 vote
0 answers
60 views

QT application menus don't drop shadow under KDE plasma

QT applications, like Qt Creator, menus don't drop shadow under KDE Plasma 5. I would expect a better integration between KDE and Qt. Even Gtk3/Gnome applications have menus with shadows, but not Qt!? ...
Espinosa's user avatar
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-1 votes
1 answer
140 views

Incorrect shell output encoding

I'm not an expert in Linux, but I am following the development of a software that runs on Linux Buildroot. The device can only use the program for the graphical interface, access the shell, or connect ...
porrokynoa's user avatar
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How to delete a qt environment in qtchooser

You can add a new environment to qt chooser by running qtchooser --install ENVNAME /path/to/qmake But how do you delete an environment you no longer need? According to the site below, you do not have ...
a-a-m's user avatar
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0 votes
1 answer
2k views

How to properly set QT_STYLE_OVERRIDE env var in GNOME on NixOS?

I have a question about theming for Qt apps on Gnome. I'm running NixOS with Gnome, using Home Manager and Flakes. My theme is Adwaita-dark, but I've noticed that some Qt apps such as VLC do not have ...
user22311319's user avatar
2 votes
1 answer
7k views

How do I install Qt 6 in Debian Bookworm?

A few years ago, I remember installing Qt 5 with a single apt install ... command, although I don't remember exactly which package I was installing. Looking to install Qt on a new Debian 12 Bookworm ...
Arseni Mourzenko's user avatar
2 votes
2 answers
665 views

Default monospace font in Qt applications

In the file ~/.config/fontconfig/fonts.conf i have set monospace to DejaVuSansMono: <alias> <family>monospace</family> <prefer><family>DejaVuSansMono</family>&...
August Karlstrom's user avatar
4 votes
1 answer
11k views

How to enable dark theme for Qt applications?

How can I enable a dark theme for Qt applications, while running from XFCE/i3/etc (NOT from Plasma)? If your main DE is Plasma, the task is easy: you just switch your Plasma's style. However, Qt doesn'...
VasyaNovikov's user avatar
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1 vote
3 answers
715 views

Zoom not starting because of undefined symbol from libqtquickcontrols2plugin.so

I did a minimum debian stable system installation using debootstrap, but zoom is not able to start in such environment: $ QT_DEBUG_PLUGINS=1 /opt/zoom/ZoomLauncher $ tail ~/.zoom/logs/...
xpt's user avatar
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0 votes
0 answers
442 views

libhdf5.so.200, needed by /opt/opencv3/lib/libopencv_hdf.so, not found

I developing C++ application with Qt&OpenCV. Last week i was building my application without any error but now I got the error: /usr/bin/ld: warning: libhdf5.so.200, needed by /opt/opencv3/lib/...
feinaps's user avatar
  • 21
2 votes
0 answers
420 views

Qt app doesn't apply Kvantum themes correctly on Fedora

So I've been using apps that use the Qt engine like: Prism Launcher or PeaZip with the Kvantum engine to theme those app. And in most of the apps I have, while some part of it are themed correctly, ...
Quan's user avatar
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0 answers
132 views

Debian Sid, legacy nvidia 340.108 driver ruins running Qt software

Debian Sid. With nouveau all working good. But after installing legacy 340.108 nvidia driver for my gf9800 i have Segmentation Fault at launching all Qt GUI software. And opposite, Qt works again ...
Alexander Procenko's user avatar
4 votes
2 answers
2k views

KDE Plasma problems: All launchers broken, app launcher empty, desktop error message, all file associations missing

After updating Qt to 5.15.8 (testing, ~amd64) on my Gentoo system running KDE Plasma 5.26.5 (~amd64), I'm dealing with a bunch of issues with the desktop: All launchers are broken, appearing as blank ...
bwDraco's user avatar
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0 votes
0 answers
637 views

How to use Qt Creator

I'm not a programmer, I just want to get pdf4qt working so I can see if it's a decent pdf editor for Debian Buster. I opened it and tried to configure and got the following: Running "/usr/...
1toneboy's user avatar
  • 441
0 votes
0 answers
914 views

Performance issue with alpine musl library

In order to build a complex C++ software based on Qt framework, I have prepared an alpine toolchain (for x86_64). This toolchain chroot contains : the alpine base package 3.16 a list of installed ...
TLILI Nassim's user avatar
2 votes
1 answer
984 views

How to show seconds in time format of KDE lock screen?

I am using Russian locale and I use KDE. When locking screen with Meta + L, you see the current date and time on it. The time is in format "12:34". I want to change it to "12:34:56"...
Ashark's user avatar
  • 979
1 vote
1 answer
2k views

Debian bullseye: touching the touch-screen with a finger does not click on objects in Qt/Plasma applications

I am testing Debian Bullseye on a Thinkpad X1 Yoga Gen 6, using a live cd with KDE and non-free drivers (debian-live-11.5.0-amd64-kde+nonfree.iso). I'd like to be sure that everything I need works ...
ggll's user avatar
  • 153
0 votes
1 answer
509 views

Qt statically linked application error: linuxfb plugin not found by the application

I have successfully developed a graphical Qt 5.15.2 application using Qt Creator with dynamically linked libraries. For various reasons I have determined static linking would be better for my ...
amyers's user avatar
  • 21
2 votes
0 answers
2k views

OBS Studio : Could not find the Qt platform plugin "wayland" - Arch Linux

I encountered this problem after re-installing Arch Linux, in the previous version of my arch system was working properly, but it is not working now, here is the terminal log output: qt.qpa.plugin: ...
DevProd_'s user avatar
0 votes
1 answer
294 views

render glyph failed when running some qt apps

When i run some qt apps like "openRGB" or "Telegram-Desktop" they close immediately after opening them. If i run them from terminal i get an error saying: render glyph failed err=...
Diego Segura's user avatar
1 vote
0 answers
173 views

How do AppImage tools decide what .so files to include? Why produced different .so-files-including list from different distros?

Compiled a Qt project and created .AppImage for it, on two different Linux distros ( Qt was installed via different ways). The two output .AppImage contain different .so files. Both .AppImage run. I ...
garywill's user avatar
0 votes
1 answer
701 views

Can't theme programs in Qtile

I followed this guide: https://github.com/antoniosarosi/dotfiles. Programs like Thunar, Firefox, and qbittorent don't seem to follow the theme. I installed lxappearance, kvantum, and qt5ct and tried ...
Yousef's user avatar
  • 111
0 votes
1 answer
617 views

QSqlDatabase: QMYSQL driver not loaded error in zorin os

Recently I have installed Zorin os and qt creator from [enter link description here][1] [1]: https://flathub.org. I need to connect the lamp server which I have installed. I am using qt creator and ...
coder_hasib's user avatar
0 votes
1 answer
79 views

Weird behaviour of bash in Kali Terminal (Qt I think) - piping to nc ends with awaiting input forever

I've been trying to pipe bytecode to netcat (nc) like this: python3 -c "import sys;bof='a'*16;bof2='a'*8;sys.stdout.buffer.write(bof.encode('ascii')+b'\xef\xbe\xad\xde'+bof2.encode('ascii')+b'\...
Sir Muffington's user avatar
0 votes
1 answer
1k views

How to install KDE / Qt / Plasma themes without the full Plasma package?

How do I install KDE / Qt / Plasma themes without installing the full (rather big) Plasma package? Or specifically in my case: How do I install a Dark theme for Kate editor?
VasyaNovikov's user avatar
  • 1,306
1 vote
1 answer
2k views

How to run a graphical application as another user?

Let's an user A (userA) wants to run in his graphical session a graphical application as user B (userB). How is it done it on a modern GNU/Linux system?
Scrooge McDuck's user avatar
3 votes
1 answer
2k views

What is SUSE's rationale for shipping Python 3.6 in Leap 15.4?

I recently switched from a Ubuntu 20.04 based distribution to openSUSE Leap 15.4. While I feel more comfortable with some of SUSE's packaging decisions, certain others are confusing me. As a Python ...
mara004's user avatar
  • 147
2 votes
1 answer
117 views

Qt applications settings

where's the path in which Qt application will save default settings for all users? Wanted to set out some default settings for an old clumsy person... Thanks in advance
Sneakatoo's user avatar
0 votes
0 answers
296 views

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 ...
juod's user avatar
  • 131
0 votes
0 answers
926 views

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=...
Freedomrunner's user avatar
2 votes
1 answer
1k views

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 ...
Artem S. Tashkinov's user avatar

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