Questions tagged [qt]

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

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How does RDP client on Linux work, such as widgets rendering?

I am curious how the widget rendering is implemented in a Linux RDP client, such as Remmina, on a high level. If RDP protocol transmit semantics as much as possible rather than bitmaps, then the ...
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QT and vnc - gui not showing up

I have a software package (that I do not wish to name) and I am pretty sure the problem is not with it. An initial gui pops up with it and then allows choices for 8 different gui's to pop up ...
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64 views

Anki won't start on Ubuntu 20.04 because of Qt error

I am tying to run Anki on Ubuntu 20.04 by following the instructions on their webpage. However, trying to start it from either the command line or apps menu does not work. The error is the following: ...
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27 views

Python Import Error (GLIBC)

I am working with the PySide2 and Shiboken2 modules in Python 3 for Qt GUI development. Shiboken 2 is throwing an error when running. The Miniconda package came with libstdcxx-ng 8.2.0 and libgcc-ng 8....
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19 views

vlc's so not found (ld -laxvlc -llibvlc -llibvlccore -lnpvlc) not found

I am trying to build a Qt web app, but it is giving me linking error for certain VLC libraries /usr/bin/ld: cannot find -laxvlc /usr/bin/ld: cannot find -llibvlc /usr/bin/ld: cannot find -llibvlccore /...
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202 views

Could not find the Qt platform plugin “wayland”

I get the following error when I run vlc: $ vlc VLC media player 3.0.11 Vetinari (revision 3.0.11-0-gdc0c5ced72) [0000561d2cc24a30] vlcpulse audio output error: PulseAudio server connection failure: ...
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11 views

How to debug Qt-application installed via Flatpak

I'm trying to enable debug for QOwnNotes application installed via Flatpak (following this tutorial: Debugging a Flatpak application). I have installed application itself and debug parts for its Sdk ...
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2answers
58 views

How to make the toolbar and tabs-bar of qterminal dark?

It looks ugly. How can i fix it.Terminal has good dark style. Also , ubuntu regular font is not available in preferences of terminal but its installed. Any idea how to fix qterminal along with this?
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1answer
14 views

Where does Fedora (31+) store the list of apps for which Qt Wayland is disabled?

Since Fedora 31 Qt Wayland is on by default, which has led to some compatibility problems with some apps, which was solved by a fallback list. One can of course turn off Qt Wayland just for some app ...
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72 views

How do I upgrade qt version?

I've been looking around for the answer to this, but the answers are all geared towards python developers. I am not a python developer but I need to upgrade my qt version so I can use the ODA File ...
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43 views

On RHEL 7.6 I get “qt.qpa.plugin: Could not load the Qt platform plugin ”xcb“ in ”“ even though it was found.” in a Qt demo script

I have a demo script like from PyQt5.QtWidgets import QApplication, QLabel app = QApplication([]) label = QLabel('Hello World!') label.show() app.exec_() When i run it I get the error: qt.qpa....
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50 views

Unable to run Eagle PCB software on Fedora 32 linux Intel 64 platform (problem related to “xcb” and “QT”

I'm having trouble understanding console debug data while trying to get Eagle PCB layout software installed on my Dell laptop running Fedora 32. I've included console debug output below in the hope ...
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1answer
50 views

libKF5Parts SO Undefined Symbol Arch

When starting programs such as Okulus and Dolphin I get the following error: symbol lookup error: /usr/lib/libKF5Parts.so.5: undefined symbol: ...
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44 views

Where is Qt located after installation in ubuntu?

ubuntu 20.04 TLS I need to install the Qt libraries and follow this path: "PATH_TO_QT/QT_VERSION/QT_ARCH/lib/cmake" (for example /home/user/Qt/5.9.1/gcc_64/lib/cmake or Users/edouard/Qt/5.7/clang_64/...
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35 views

Rotate touchscreen in CLI mode

I'm asking for the help with my problem. I'm developing a Qt GUI application, that will run on Raspberry Pi 4 as an embedded device. I need to run my app at boot without showing the desktop to the ...
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12 views

What may be causing some Qt/KDE thing to capture Mod4+e (effecting Dolphin) and Mod4+d (effecting nothing)?

What may be causing some Qt/KDE thing to capture Mod4+e (effecting Dolphin) and Mod4+d (effecting nothing)? Some Qt/KDE gets started at some point of my session usage flow by something, and it ...
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1answer
48 views

Okular can only open files from certain folders

I use okular for annotating some of my PDFs but have been having an issue recently where I can only open files that are on my SSD where I installed ubuntu, but not on the 2nd hard drive (located at /...
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1answer
45 views

Linux (Manjaro) inferring QML type from a .py file

First of all, this is my first post, so I hope I'm following the proper guidelines and am stating the issue clearly. I'm personally not too Linux-savvy, only using it to do some code on occasion, ...
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65 views

Your system needs to have a fully qualified domain name (fqdn)

I am trying to install some Qt libraries like this: sudo apt-get install libqt5webengine5 libqt5webenginewidgets5 But I keep getting such errors: The hostname -f command returned: $1 Your system ...
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22 views

Install Qt WebEngine Widgets

I am running a Qt cmake project which gives me an error that: Could not find a package configuration file provided by "Qt5WebEngineWidgets" with any of the following names: ...
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12 views

GUI unresponsive for many applications

Essentially the issue is that for a handful of graphical applications the interface doesn't respond to input in real time, instead it just freezes and will only update if I reload my window manager (...
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23 views

GTK/QT File Chooser: automatically search in subfolders

is there a way to let these two file choosers automatically look in subfolders? Up until a few months ago, I could be in the gtk3 file chooser in /home/me and type 'stock' and it would suggest /home/...
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647 views

version `Qt_5_PRIVATE_API' not found

I am trying to install a program (zoom) on a Linux Fedora 29 64bit installation. I think I have all prerequisites installed, but one problem remains [root@myhost~]# ldd /opt/zoom/zoom | more /opt/...
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1answer
57 views

Inconsistent theme in Pop OS

I'm currently using Gnome PopOS 19.10 on a fairly recent machine Acer Swift 3 SF315-41-R03D, and I've been using Linux for around a year. After I had a clean install of PopOS, I updated everything ...
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14 views

windows management software under ubuntu

i'm here o linux but i want o know if is possible to controll two windows of two aplications (softwares) with the same master windows. Example, i want o run [gedit] and [terminal] like one single ...
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1answer
26 views

Yocto version v3.21.0 & QT5

I am using yocto v3.21.0 i.e poky-2.4.3. Trying to add QT5 to the yocto image. I am following this link :-- Using yocto with qr5 I have added layer for qr5 :-- ${TOPDIR}/../meta-qt5 I have to ...
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1answer
125 views

Troubles autostarting Qt app on Yocto Raspberry Pi3

I'm looking to boot my Pi as quickly as possible into a Qt application. Following this guide I successfully built a Yocto Linux with the necessary Qt dependencies, and I can launch my Qt app by ...
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34 views

Switching from GNOME to KDE

I am here to ask you for an help: since I have been using Linux (more than 10 years ago now...) I used to use GNOME, starting from 2.2x until latest 3.34 with gnome-shell and I always loved it. But ...
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22 views

how to create symlink qt5.12. to qt.5.5.1

the program that I want to run requires qt5.5.1 while I use qt5.12. but unfortunately I don't know where is the qt directory?
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1answer
108 views

trying to find qt4 libraries on centos7

I am installing the default QT on the base yum repos (version 4: sudo yum qt qt-devel. I can see that it includes the bin (in /usr/lib64/qt4/bin) and the includes (in /usr/include/Qt , /usr/include/...
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108 views

Error in Processing Project File with qmake,qt in Linux mint

I tried to build .pro file with qmake version 3.1 getting this error /home/astrogirl/Downloads/Gadget-2.0.7/Analysis/energy_galaxy.pro:29: Assignment needs exactly one word on the left hand side. /...
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39 views

Qt and dual monitor with touch screen

I have a Qt-based program (using eglfs platform), and 2 monitors, one LVDS and the other one is connected by HDMI. The LVDS monitor is a touch screen. The screen of HDMI is placed to the right of the ...
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1answer
978 views

No module named 'PyQt4.sip'

So, I have a .py file: from PyQt4.QtGui import * from PyQt4.QtCore import * When I'm executing it - I have this error message: Traceback (most recent call last): File "kek.py", line 1, in <...
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1answer
138 views

QT 5.10 not found // XP Pen Driver

So i was trying to install the XP Pen Driver for my Deco 01 v2 graphics tablet on my Linux Mint 19.2 Tina when i came to encounter the following error: ./Pentablet_Driver: /usr/lib/x86_64-linux-...
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1answer
162 views

Normal user run Qt C++ program as root without sudo?

I am writing a robotics program in C++, using Qt for the GUI, where each thread needs access to hardware. The library which accesses the hardware is called pigpio, and it modifies /dev/mem, so it ...
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1answer
25 views

Cedilla does not work under Softmaker Office

Infos here Cedilla works in all other apps but SoftMaker office where it delivers a ć. What might I be missing? This might be some QT/GTK issue but I'm not sure about how to fix.
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401 views

Why I can not install qt5-default on raspbian buster

I used katoolin to install some updated qt5 softwares. After I removed the links from the sources.list file everything was okay. I uninstalled the qt5-default then. Today when I tried to install qt5-...
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1answer
34 views

Build an embedded setup with custom QT/X11 application as desktop background

I am writing a custom application in QT5 (for X11), which will be used in an embedded setup. When the system boots, I want the system to boot into my application, with the main window of my ...
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96 views

Valgrind crashes in Qt Creator, related to video card?

I am using a Core i7 PC with NVIDIA GM107 GeForce GTX 750 Ti video card running Linux Mint 18.3. "Valgrind Memory Analyzer" crashes when running a blank "Qt Widgets Application" project in Qt Creator ...
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479 views

How to solve 'rsync' errors?

I have been trying to cross-compile Raspberry Pi applications from Ubuntu 18.04.3 to the Raspberry Pi 3 with Qt 5.12.5. The guide I used is from here: https://mechatronicsblog.com/cross-compile-and-...
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53 views

Clementine qt default theme reset after each start

I'm using Manjaro with the XFCE desktop environment. Some programs, especially clementine (music player), keep bugging me, because the theme seems kind of broken. My default GTK-theme right now is ...
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14 views

Qt4 WindowsStayOnTop on LXSession

I'm running an application on raspberry pi which uses qt4. My application have different windows, main window and dialogs. When I run my application on raspberry pi desktop it works fine Qt....
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1answer
367 views

Does mixing up GTK and Qt applications slow down the machine?

Usually it is recommended to either use GTK or Qt apps in the operating system, but not mixing them both together. Example: When using KDE it seems to be obvious to use KMail (Qt) instead of ...
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60 views

How do I auto duck volume of applications in Linux?

For myself I'm building a navigation/dashcam/music unit for my motorcycle. This consists of a Qt application which captures 2 windows from my navigational software and music player. To do this, I have ...
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1answer
725 views

Scanning and connecting to wifi using Qt and wpa_supplicant.conf

I am writing a Qt based application on a ARM linux device. I want to be able to create wifi functionality in the most efficient way. Currently I am using QProcess to run a script that modifies the ...
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2answers
5k views

How to install qt5 in Fedora 30

I really have no clue about how to install qt5 in Fedora 30. I need to use paraview which complains about some missing software: $ ./paraview ./paraview: /home/jimmy/Scaricati/ParaView-5.7.0-RC2-MPI-...
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70 views

Fonts look pixelated in some applications

I use KDE, I have a HiDPI display, so I made changes to ~/.Xresources to change the system DPI. After that, the fonts in some applications began to look pixelated. In QtCreator, with QT_SCALE_FACTOR=...
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1k views

Makes errors in native build Qt installtion

I have trying to build QT5 5.12.3 on Raspberry Pi zero via these site instructions: wget http://download.qt.io/official_releases/qt/5.12/5.12.3/single/qt-everywhere-src-5.12.3.tar.xz tar xf qt-...
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2answers
110 views

Kali linux is getting slower because of using python3 and multithreading

I have Kali Linux operating system, and lately i have been working with python scripts ( creating GUI using python and QT5) and i am using multiprocessing and multi-threading in my code. However I ...
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331 views

Cannot mix incompatible Qt library (version 0x50c03) with this library (version 0x50c00)

I use alpine-php fpm docker container for developing and deploying a php application. I want to use wkhtmltopdf for generating pdfs. I installed by using apk add wkhtmltopdf But when I run it I ...

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