Questions tagged [qt]

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

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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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Synchronize Qt4/5 with PyQt4/5

I am trying to run HP's printer software which was upgraded recently and broke all my printing. Apparently they use Qt now so it is some kind of requirement so I spent 2 hours building all this Qt ...
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1answer
91 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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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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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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23 views

Building QT statically out of tree from source with XCB

I'm trying to build QT 5.15 statically from source out of tree with GUI enabled and have problems with XCB. I am trying to build on Ubuntu 20.04 and used https://wiki.qt.io/Building_Qt_5_from_Git as ...
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Improve gradients when displaying application in the framebuffer

I'm developing an Qt GUI application which will be run on the Raspberry Pi 4 with Raspberry Pi Os 10 on it. I need it to run as fast as possible after the device is boot and the user should have ...
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How to remove Qt on ubuntu and raspberry (after cross compilation)

I just cross compiled QT on ubuntu for my raspberry https://github.com/PhysicsX/QTonRaspberryPi/blob/main/qt5.14.2onRaspberrypi this is the code that I followed. I think that I did something wrong ...
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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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BrokenPipeError: [Errno 32] Broken pipe Cannot mix incompatible Qt library (5.15.0) with this library (5.15.1)

I installed the Kate text editor on my KDE Neon 20.04 which is an Ubuntu based distro. So when I tried to open Kate nothing happened, so I tried to open it in the terminal to see what error happened ...
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GLib-GObject-WARNING **: 23:33:33.205: cannot register existing type 'GdkDisplayManager'

Running the wireshark command after installing it with "pacman -S wiresharek-qt" returns this: (wireshark:37116): GLib-GObject-WARNING **: 23:33:33.205: cannot register existing type '...
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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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1answer
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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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1answer
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Kill all processes that are using qt5

I would like to run a pyhton 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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2answers
150 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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Segmentation fault when trying to launch snap package

Until today I've been able to launch the snap package 'yubioath-desktop' as normal with /snap/bin/yubioath-desktop. Now the screen flashes something instantaneously before disappearing. System info $ ...
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I ran kdialog from Wolfram Mathematica and it gives a cryptic error

I ran RunProcess[{"/usr/bin/kdialog", "--yesno", "Yes?"}] in Mathematica on a raspberry pi with kde and it gives me: "StandardError" -> "/usr/bin/...
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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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468 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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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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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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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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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
157 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
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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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1answer
251 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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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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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
117 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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663 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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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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14 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
101 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
58 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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169 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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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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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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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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1answer
1k 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
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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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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
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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
244 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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1answer
325 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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1answer
113 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
2k 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
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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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