Questions tagged [qt]

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

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How to generate Qt debug libraries in Yocto SDK?

I am using Qt from Yocto Sumo branch and I am looking out on how I can install the libQt debug libraries in the SDK. I could find any option to turn it on. I have already tried. ...
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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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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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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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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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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
168 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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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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65 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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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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161 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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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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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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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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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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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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190 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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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
327 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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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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How to repair qt5

I keep getting the following errors whenever I try to start the KDE environment on my Ubuntu 19.04 install: ksplashqml: /usr/local/lib/libQt5Gui.so.5: no version information (required by ksplashqml) ...
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Unexpected xkb behaviour 3-level return

I've let Return work as a level-5 shift on the 3rd level: key.type = "THREE_LEVEL"; key <LCTL> { [ Control_L, Control_L, ISO_Level5_Shift ] }; key <RTRN> { [ Return, Return, ...
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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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Is there a method to recognise different linux distro in Qt .pro file?

For ArchLinux, the python3 .so is at /usr/lib/libpython3.7m.so, However, in Debian-based distros, the library path for python is at: /usr/lib/x86_64-linux-gnu/libpython3.7m.so How can I write the ...
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678 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
80 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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243 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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1answer
141 views

Debian: Can't install qtcreator because of broken packages

I'm trying to install qtcreator or any other qt development package but it's not working because of broken packages. I then tried to install qtcreator manually from the qt website but I can't compile ...
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541 views

Fedora 29 with KDE - Xorg / QT - QXcbConnection: XCB error: 3 (BadWindow)

When running Katalon Studio or other Java apps with UI and i select an object of type combobox or list, an interface turns black and the application freezes and crash mai 26 16:21:04 tuxzao kwin_x11[...
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186 views

How to use QT to open the Linux terminal and run the written shell in the terminal

I want to open a terminal in QT and run a shell script on a terminal. I use the system() command like this but the terminal always Flash past by: system("gnome-terminal -x bash -c 'sh auto.sh'&")...
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Could not load the Qt platform plugin “xcb”

I'm using xubuntu 18.04(Linux 4.15.0-48-generic x86_64 )(buildd@lgw01-amd64-036) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #51-Ubuntu SMP), after installing anki as shown on anki's web: $ tar xjf ...
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1answer
204 views

Couldn't load SIP module. Python support will be disabled

I installed QGIS version 3.6 on my pc with Lubuntu 18.10 64 bit. I have python 3.6.7 and QT 5.11.1. Once I run QGIS i get this error Couldn't load SIP module. Python support will be disabled. ...
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Qmake Specify QT installation path

I try to compile the minitube on ubuntu 16.04LTS using the non-repository installed version of Qt as seen in: http://sourcedigit.com/19858-how-to-install-qt-5-6-1-on-ubuntu-16-04/ and after making the ...
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43 views

Qgis and qtdesigner4: /lib64/libQtWebKit.so.4: undefined symbol

I am trying to launch two programs but there is a problem with /lib64/libQtWebKit.so.4 qgis: qgis: symbol lookup error: /lib64/libQtWebKit.so.4: undefined symbol: ...
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90 views

Set default file encoding to ASCII?

Years ago, most text editing applications had the option to set the default file encoding to US-ASCII. Now I can't find any recent editor on Linux that allows you to choose ASCII. If the purpose is to ...
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182 views

No mouse cursor in Qt EGLFS on Yocto

I am trying to use mouse cursor in Qt5 application. When I run ./Qt5_CinematicExperience : Failed to move cursor on screen HDMI1: -14 Could not set cursor on screen HDMI1: -6 There is no mouse ...
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283 views

Problem with dead-key in linux (debian + KDE)

I am trying to have a clean configuration for my keyboards and layout. I want to be able to switch between FR layout and US international layout with dead keys. When I switch using the GUI it works ...
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138 views

Make Anki use system-wide desktop theme

I have installed the latest linux mint (19.1 Cinnamon) on my laptop, and downloaded the latest anki (v2.1.6) directly from the website. Previous versions of anki were distributed as .deb files, but ...
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2answers
2k views

Start a Qt/wayland application on top of weston on startup

I would like to launch a Qt application on start up. The application uses some of the features from weston/wayland desktop, so it should be launched on top of weston, right after weston is started. ...
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246 views

“make xconfig” raises a Qt error

When I call make xconfig in my linux kernel source directory, I get the following error scripts/kconfig/qconf Kconfig Gtk-Message: Failed to load module "canberra-gtk-module" Qt: Session management ...
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3answers
165 views

Meta key issue when using Emacs terminal on Lubuntu LXQT

While pressing Alt key on the keyboard the control is transferred to the terminal menu. There is an option in ubuntu terminal (Edit -> Preferences) to disable this Enable mnemonics (such as alt + ...
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117 views

How can I correctly display Chinese characters on Debian 5?

When I try to use Chinese chars on a QT application, my pc shows rectangles instead of Chinese characters. My old system is version Debian 5 , I can use Chinese chars in Debian 8. I use the same font ...
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1answer
104 views

GTK and Qt apps seem to interpret XCompose differently

I'm using Ubuntu 18.04. By default, typing something like ^2 produces ², which I don't want: I want it to be ^2. I found out that to accomplish that, one has to set GTK_IM_MODULE=xim and QT_IM_MODULE=...
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1answer
233 views

Can’t run the ownCloud client on Linux Mint 19 Tara (Qt issues)

I have a problem running the ownCloud client on Linux Mint 19 Tara. It doesn’t start. If run from the command line, it gives me these errors: pavel@lenovo ~ $ owncloud owncloud: /usr/lib/x86_64-linux-...
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1answer
113 views

Upgrade from Ubuntu 17.10 to 18.04 Broke Texstudio/Qt

After performing a dist upgrade from 17.10 to 18.04 texstudio no longer runs. I get the following error This application failed to start because it could not find or load the Qt platform plugin "xcb" ...
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288 views

xfce4-terminal in fluxbox follows a different style/theme to xfce4-terminal in xfce

I am using xubuntu 18.04, but this question should preferably be applicable to all linux installations having both desktop managers "xfce" and "fluxbox". So I have started with xubuntu (i.e. ubuntu ...
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1answer
1k views

How can I upgrade my deb package

I have qt project and deb package that is built using following command: dpkg-buildpackage -us -uc After this action, my package is ready to install. But if I have my package installed and I want ...
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2answers
249 views

Plasma-browser-integration breaks with `export QT_QPA_PLATFORMTHEME=“qt5ct”`

I use plasma-browser-integration (not using KDE) to get firefox websites (like youtube, netflix..) to respond to mpris commands like play/pause, and to get the playback status (playing/paused) so I ...
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3answers
18k views

Ubuntu 18.04.1 LTS x64: how to update Qt 5.10 from Qt 5.9.5?

I'm on Ubuntu 18.04.1 LTS x64 and I need to update my Qt 5 installation from v5.9.5 to v5.10.0, however when I issue the command sudo apt-get install qt5-default it gives me that qt5-default is ...
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2answers
610 views

How to restore Okular default (toolbar) settings

I've somehow managed to remove the toolbar and menu-bar from Okular. After I've found no way to reactivate them from "outside" – sice I can't click on Options anymore – I've tried to reinstall a clean ...

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