Questions tagged [qt]
Qt is an application and UI framework. The K Desktop Environment is based on QT.
283
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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'...
- 1,088
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8
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Qt apps and graphic tablets, lag when dragging
I am using graphic tablet, I am designer, and I am having issue with some Qt apps. One of apps is Scribus. Everytime I need to drag something in app, like create new shape, or move some text, it will ...
- 101
1
vote
3
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128
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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/...
- 1,093
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40
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Having trouble installing Qt 5.15 on Zorin OS
I am trying to install qt 5.15 on zorin os because it is needed for some program to run.
I try to add qt 5.15 on my system by doing the following:
Adding the repository:
sudo add-apt-repository ppa:...
- 3
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0
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89
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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/...
- 21
1
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0
answers
97
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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, ...
- 61
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0
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97
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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 ...
3
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2
answers
589
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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 ...
- 3,183
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209
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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/...
- 71
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434
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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 ...
- 19
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1
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264
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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"...
- 686
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74
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V4l2 and Qt Multimedia
Has anyone tried using a virtual camera using qt multimedia. I tried using Media devices.video Inputs(), but there was no virtual camera in the output
1
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1
answer
813
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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 ...
- 153
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1
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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 ...
- 21
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0
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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: ...
- 41
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1
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139
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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=...
- 101
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0
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80
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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 ...
- 31
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1
answer
242
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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 ...
- 11
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1
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284
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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 ...
- 11
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1
answer
33
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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'\...
- 717
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681
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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?
- 1,088
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673
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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?
- 934
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250
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How debug core dump created on remote ARM machine?
How do I debug a segmentation fault in an application created with QT Creator for a remote ARM device with a core dump?
In QT Creator, with my Project open, I go to Debug > Start Debugging > ...
- 121
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1
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1k
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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 ...
- 128
2
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1
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76
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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
- 21
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0
answers
160
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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 ...
- 131
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604
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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=...
2
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1
answer
454
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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 ...
4
votes
1
answer
874
views
Existing .so file cannot be loaded even though it exists, seems to depend on Docker host OS
I have built Qt6 in an Alma8 based Docker container, with the Docker host being Fedora 35.
Under some circumstances (described below), all Qt libs cannot load libQt6Core.so[.6[.2.4]]. But that file ...
- 171
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47
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If it is possible to track the "text input state" system-wide? How?
Is it possible to track that system is currently in "text-input state" := when the window that has text input field (or "text input possibility" to be more general) is open now and ...
- 33
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89
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Audio in Qt6 application does not work if run from cron of systemd
Ubuntu 21.10, Qt 6.2.0.
In my QML I have a MediaPlayer:
MediaPlayer {
id: mediaPlayer
videoOutput: videoOutput
audioOutput: audioOutput
onErrorOccurred: { console.log(mediaPlayer....
- 667
0
votes
1
answer
181
views
TCL - Error in startup script: expected integer but got "Sans"
I am trying to run a tcl script using wish as
$ wish main.tcl
output of the command is
Error in startup script: expected integer but got "Sans"
(database entry for "-font" in ...
- 1,162
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0
answers
488
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Maximum number of clients reachedqt.qpa.xcb: could not connect to display :0
I am using Linux Mint 20.1 Cinnamon with kernel version 5.4.0-97-generic. I am facing recent issue when try to open okular from terminal or start-menu..
Maximum number of clients reachedqt.qpa.xcb: ...
0
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1
answer
3k
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How to change Qt/Gtk theme using CLI
I can change the theme using lxappearance and everything works. This includes pcmanfm, gnome-disks, firefox, and qalculate-qt themes being changed. Using gsettings set org.gnome.desktop.interface ...
- 131
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0
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76
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Inputing accented letters in Qt applications on Cygwin
I am a native Portuguese speaker, and I am having problems when typing accented characters in any Qt application running on Cygwin.
Almost always, the result on the screen for any accented letter I ...
- 183
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0
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1k
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CMake error "Could not find a package configuration file provided by "Qt5QuickControls2""
I'm trying to build the vvave music player on Debian11/KDE but running cmake .. fails - it shows this error:
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:23 (project):
...
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2
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3
answers
1k
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ImportError /usr/lib64/libQt5Core.so.5 - in several software packages
Working with Fedora 35: I want to run a few different software packages that share a dependency, seemingly Qt.
In the shell, I get this response, from Cadence and other software:
ImportError: /...
- 1,605
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1
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20k
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How to add QT_QPA_PLATFORMTHEME=qt5ct environment variable in Arch Linux?
I am using a standalone tiling window manager QTile. In QTile I want to organize my GTK and QT Themes. For GTK theme I used a program named "lzappearance" and it works perfectly fine. But, ...
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E: Unable to correct problems, you have held broken packages. (Debian 9.13)
To install Qt on a motherboard I need to download several packages, but every time I get this error in the libxi-dev package. I tried to download the dependencies separately but it still didn't work. ...
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502
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i3 GTK & Qt theming problem
Applications that use Qt and GTK look different how can I fix this, i’m using i3 is there any software to theme Qt?
PS: I’ve heard about lxappearance but it only works for GTK
- 11
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930
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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" on arch linux
I'am currently trying to get some images outputted after running this code:
import cv2 as cv
import matplotlib.pyplot as plt
img = cv.imread('Photos/cat.jpg')
cv.imshow('cat', img)
plt.imshow(img)
...
- 31
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0
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157
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qt5 program with "-platform linuxfb" does not reset framebuffer when crashing
We have a qt5 program running under Alpine Linux v3.14 which uses a fragile legacy library which may cause the entire program to crash. Alpine Linux switches to framebuffer mode during start up. We ...
- 1,031
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2
answers
777
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Install qt3 on Centos 8
I was able to download the qt3 yum package
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/qt3-devel-3.3.8b-51.el7.x86_64.rpm
but there were some dependencies missing when installing
...
- 393
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63
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TeXStudio Dependancy issues - Ubuntu
I was trying to install tex studio using
sudo apt install texstudio
But some dependencies are missing here. I understand that they are primarily the Qt libraries. I tried to install from qt website ...
0
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1
answer
286
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Programmatically Trigger Drag&Drop Events on Linux
I currently working on an interactive video stream application (implemented in PyQt5) which allows viewers of the stream to interact with the streamer's system, for example by moving the mouse cursor ...
- 1
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1
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855
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Can't change Qt version from 5.12.8 to 5.15.X
I've tried building packages from qt's website but everytime I try to cmake a specific file that requests qt version 5.15 I'm always told it fails because I'm using the default version 5.12.8. How can ...
1
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1
answer
18
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Weird graphical effects on colored text with asus eeepc
I have an old Asus eeePC 1000H netbook with a weird graphical bug in the window-manager.
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics ...
- 13
1
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1
answer
90
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xdotool - Qt: failed to retrieve the virtual modifier names from XKB
I seem to be unable to make xdotool work. I'm trying to emulate keyboard shortcuts as Super+Left via external output. I looked it up and xdotool seems to do exactly that, emulate keyboard strokes. But ...
0
votes
1
answer
218
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Matlab QT libraries prevent programs from running
I have matlab on my machine with Compiler toolbox. In order for compiler code to work, it needs access to libraries. They are supposed to be saved in LD_LIBRARY_PATH
So I adjusted my .bashrc to ...
- 481
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votes
1
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809
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Overriding the custom style on a proprietary Qt5 application
I'm running KDE Plasma 5.22 on Gentoo using Kvantum for my application theme engine. I'd like to use the application Chaotica, which is a fractal rendering suite that is far superior to most others, ...
