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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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Fix font size for high-resolution screen

I have a high-resolution monitor. The font and cursor are too small for various applications. As you can see in the screenshot the font for PGAdmin is much smaller than VS code and Chrome. I thought ...
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How to install QtiPlot on Ubuntu 22.04?

I'm trying to compile QtiPlot software from sources. I just want to test it so i don't want to pay for it from the official website. The code is open and can be found here: github So i clone it in a ...
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Touchscreen issues in Ubuntu 22.04 on Raspberry Pi 4

I have QT application that I'm developing in c++ on a raspberry pi 4 with the official 7" touchscreen. During development I have been using Ubuntu 21.10 to run the application on the raspberry pi ...
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How do you resolve: PySide2/designer: symbol lookup error: ... : undefined symbol: _ZdlPvm, version Qt_5?

On Ubuntu 22.04, using Python 3.10.4, I've setup PyCharm community edition 2022.01 to use PySide2 designer (Qt) as an external tool. When I press the "create" button this error is produced ...
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Installing the fcitx5-frontend-qt5 package

I am trying to install the fcitx5-frontend-qt5 package so that I can use it on qt applications. Unfortunately, this error comes up every time: Reading package lists... Done Building dependency tree ...
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apt-get cannot install qt5-default in Ubuntu virtual box installation [duplicate]

I'm using Ubuntu 22.04 LTS running through a Virtual Box on a Windows 10 machine. For my project, I need to install qt5-default, so I run the following command: sudo apt-get install qt5-default ...
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VirtualBox with custom Qt version on Ubuntu

I am running on Ubuntu 20.04. The Qt library version 5.12.8 that is installed from the Ubuntu repository has a bug that takes effect when using a graphical tablet. I have downloaded sources of Qt 5.15....
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downgrade spyder

I have just upgraded ubuntu. As a result, spyder is not working anymore. This the error: Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway. ...
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Qt5 install problem ubuntustudio 22.04

The short version of the question: where is qt5 installed on Ubuntu Studio 22.04? The long version of the question can be seen unanswered here on the SuperCollider forums: essentially I am trying to ...
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How to fix weird icons in pcmanfm-qt on Ubuntu 22.04?

I made a fresh Ubuntu 22.04 install and I see that the icons in pcmanfm-qt are somehow odd and most of them are missing: I crawled around a bit and found a few packages, whose missingness could be ...
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521 views

How to install Qt6 on Ubuntu 21.10

When trying to open a program that requires Qt6, it gives error while loading shared libraries: libQt6Network.so.6: cannot open shared object file: No such file or directory. I tried installing Qt6 by ...
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How do you install qt on ubuntu22.04

In ubuntu20.04 qt5-default was the package name. So I tried the same and qt6-default in 22.04. Then I tried apt-cache search qt which revealed (among many others): qt6-base-dev and qt5-base-dev. I am ...
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How to solve QT Make File 5 error

My OS is Ubuntu Desktop 18.04. QMake version 3.1 I'm using Qt version 5.9.5 in /usr/lib/aarch64-linux-gnu . When I build the project I get the qt Makefile 5 error. How can I solve this? makefile:248: ...
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Applyin GTK themes to Dolphin?

Is there a way to apply GNOME GTK theme (I use GNOME 40.5 and Ubuntu 21.10) to Dolphin File manager? As Dolphin is QT, I guess I cannot apply the same exact theme used by GNOME on that, but if there ...
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Syntax Error on accessing JSON data in QML data from python youtube_dl

I have a simple youtube_dl function to access the youtube download links here, @QtCore.Slot(str, result=str) def getDownloadLinks(self, url): try: with youtube_dl.YoutubeDL({}) as ydl: ...
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Install 20.04 system libraries in 21.10

I'm facing a weird problem. I develop Qt/C++ applications. Until yesterday my dev machine and the target ones were both running Ubuntu 20.04. Yesterday I had to upgrade my dev machine to 21.10 in ...
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Broken RStudio, VLC, and other apps because of Qt incompatibility on Ubuntu 20.04

I updated my system to use the lastest RStudio version, which required to install Qt from Qt's website (https://d13lb3tujbc8s0.cloudfront.net/onlineinstallers/qt-unified-linux-x64-4.2.0-online.run), ...
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Cannot run Spyder on Ubuntu (windows bash)

I am very new to Linux and I am using Windows 11 installed ubuntu bash from MS store and installed Spyder using this command sudo apt-get install spyder But when I call Spyder I get this error user1@...
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Qt 5.9.5 apps stopped show window content in 18.04

I had to install Xubuntu 18.04 because of one camera kernel driver, which refuse to operate in 20.04 kernel. Then I installed qt5-default and qtcreator (version 5.9.5). Camera application was ...
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Increase scroll speed in Okular only

Okular scrolls (at least when using two-finger touchpad scrolling) much slower than most other applications on my computer (in particular evince). Is there some way to increase the scrolling speed ...
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Styling the split pane window in Konsole

Konsole allows you to use style sheets to customize the Tab bar. Is there a similar mechanism to customize the split pane window title bar? Specifically, the gray area that says ":bash" and &...
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1 answer
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Tool bars and writing in app are unreadable in kavantum-dark theme

I have been using kavantum-dark theme in Lubuntu-20.04.3 Most of the apps run fine. But there are few in which the tool bars and writing in the app are unreadable. But this does not happen in other ...
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suddenly unable to boot into Kubuntu

I am suddenly unable to boot into Kubuntu, I didn't do anything weird to my system yesterday, and suddenly it does not boot, it gets stuck on the motherboards logo. I've figured out already that when ...
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1 answer
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Adding libraries to a new Linux computer for any application written in Qt 5.15

Screenshot of my application I wrote an application (launcher creator like Linux Mint's) in Qt 5.15.2 version. I completed developing and everything was ok. Then, I wanted to check it if working at ...
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OpenGL - libGL error: GLX drawable type is not supported

Good morning, whenever I try to run any OpenGL powered Application like Free Download Manager or WINE powered Games like GTA San Andreas i find that libGL is broken... Output of /opt/...
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KDE 5, baloorunner crash

I am really not sure if this is the best place to ask this question, but baloorunner is crashing constantly every time and there is no address to report this bug. The question is where is the best ...
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Need help to get rid of libtorch header erros: conflicting declaration ‘constexpr const auto torch::...’

Can't compile a simple libtorch C++ program ever since upgraded ubuntu to 21.10. Using QT Creator, tried several versions (Desktop QT 5.12.5, 5.15.2, 6.1.2, 6.2.1), both gcc & clang w/o sucess. ...
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No audio with Zoom web client running in Qt WebEngine on Kubuntu 20.04

I have tried to run the Zoom web client in two applications built with Qt WebEngine, and in neither case could I hear any audio. One of the applications was one I built myself; the other is the ...
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Lags in many apps (but not the others) when the GPU is 100% busy

I'm using Ubuntu 20.04 (default desktop install, i.e. with Gnome I suppose) and NVIDIA GeForce RTX 2080 GPU. When the GPU is 100% busy with a background process, some apps start lagging. Namely, those ...
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2 answers
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Can't Uninstall A Program (Openshot)

Ubuntu 20.04.3 LTS. Have checked other answers here and nothing is relevant. After I updated Openshot I had two different versions installed at the same time. I deleted one successfully but now the ...
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How can I make text in dialog windows selectable (for copying)?

Well, I mean more all windows rather than just dialog windows, but I can't think of a better term to start pointing in the direction of what I mean. To be more concrete: kdialog --title '...
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1 answer
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Rstudio does not launch in Ubuntu 21.04

I have installed R 4 $ R R version 4.1.1 (2021-08-10) -- "Kick Things" and then Rstudio from the installer. The software centre shows the installation as correct, I have the icon on the ...
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How do i specify multiple non-standard header locations in "make"?

I'm compiling vlc from source. Unfortunately my qt include files are not in the standard include directories. How to add these directories into standard locations.Can I set an environmental variable ...
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ImportError: Failed to import any qt binding

I want to use %matplotlib qt in jupyter notebook. I tried import PyQt5 and it worked. But when i run %matplotlib qt i got this error ImportError: Failed to import any qt binding Issue is that my ...
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Unable to start application from terminal even after setting the path; shows QT error

I am trying to run an application from the terminal but it is giving the following error: This application failed to start because it could not find or load the Qt platform plugin "xcb" in &...
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3 votes
1 answer
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How to convert .qm and .ts files to .mo or .po?

I'm working with several language files and sometimes the sources are in .qm/.ts format. I'm using Qt Linguist/Gtranslator/POEdit but AFAIK none of these can convert these files to .mo/.po. Are there ...
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Error while loading shared libraries: libQt5WebEngineWidgets.so.5: cannot open shared object file: No such file or directory

I'm trying exec the https://biz.mail.ru/myteam/ It works from the /tmp dir. But if I try run it from another dir it fails $> ~/myteam /home/user/myteam: error while loading shared libraries: ...
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RHI (Qt 6.1) not work in ubuntu?

I tried an example called "Qt 3D:WireFrame QML Example". I haven't changed anything in the code, but it works with an error. How to fix the error ?? error : Qt3D.Renderer.RHI.Backend: ...
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1 answer
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Unable to open qtspim in ubuntu

I recently downloaded latest version of qtspim from https://sourceforge.net/projects/spimsimulator/files/ in ubuntu 20.04 .Then after clicking on deb file it automatically downloaded software from ...
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Matplotlib complains about not finding Qt platform plugin "wayland"

I have trouble getting Matplotlib to work on Ubuntu 21.04. Whenever I want to plot something I'm getting the following error message: qt.qpa.plugin: Could not find the Qt platform plugin "wayland&...
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IBus input not working in QT applications

I'm using Ubuntu 21.04. IBus Chinese (ibus-libzhuyin and ibus-libpinyin) works in all gnome applications but it doesn't work for any Qt applications like Anki. I've tried adding this in ~/.xprofile (I ...
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mate-session warns about not finding a desktop file

Getting similar warnings in the system logs: Jul 14 09:11:18 precision-7510 mate-session[5184]: WARNING: Unable to find desktop file 'keepassxc.desktop': V složkách hledání nelze najít platný soubor ...
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2 votes
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Cant open qt based applications

cant open qt based applications such as qbittorrent, nomacs, etc . Getting error: nomacs: error while loading shared libraries: libicui18n.so.56: cannot open shared object file: No such file or ...
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Crazy virtual onscreen keyboard on Kubuntu

I am on Kubuntu with a 2:1 laptop. Everything works apart the default on-screen keyboard. It appears when I click inside some document with the mouse, not with my fingers. It is getting really really ...
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1 vote
1 answer
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[QT][QML] Unable to use QTLocation and QTPositioning in my QML view

in my QT/QML project created with QT 6.1 and operating system Ubuntu 20.04 I would use the QTMapView. In order to do this, I tried to install QTLocation and QTPosition by using the following command: ...
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This application failed to start because no Qt platform plugin could be initialized

I wanted to install Systemback on my ubuntu 20.04 and found this page. When I ran systemback, I get this error message. ckim@ckim-ubuntu:~$ sudo systemback& [1] 220231 ckim@ckim-ubuntu:~$ No ...
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1 answer
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Ubuntu building Qt 6.1 from source

I just moved from Windows to Ubuntu and it's a shame things don't seem to work quite so easily as in Windows. I built Qt from source on Windows and didn't have problems. On Ubuntu building is ...
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Reliable way to find application icons?

I'm creating an app in Qt Creator and C++ that lists all apps on the system by indexing .desktop files from /usr/share/applications and ~/.local/share/applications. In almost every icon path, I don't ...
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Why some GUI icons of some Qt applications in Kubuntu 20.04 look bad?

In Kubuntu 20.04 some Qt applications (Double Commander QT, SMPlayer, Apper) have icons that look bad. Apper: SMPlayer with Papirus Dark icons: with Breeze icons: and, like above, also the settings ...
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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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