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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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`qdbus` returns an error. Ubuntu 18.04

When I run followind command: qdbus I get following error: qdbus: could not find a Qt installation of '' I've read alot of old questions with same error but not one helps me. I've tried execute ...
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24 views

What is the `filedialog="@ByteArray(\0\0\0\`… in ~/.config/Trolltech.conf?

This file seems to be related to Qt and used by KDE for widgets. (1) Should it be present in a clean installation of Xubuntu (Ubuntu+XFCE)? (2) Along with normal plaintext entries like ...
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1answer
27 views

menuconfig and xconfig don't work!

when I try to use make menuconfig I get this: scripts/kconfig/mconf Kconfig init/Kconfig:1301: can't open file "usr/Kconfig" scripts/kconfig/Makefile:24: recipe for target 'menuconfig' failed make[1]:...
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1answer
61 views

Minimal Qt5 install to compile code

I wrote a little program in C++ using Qt. Back when it was Qt4, in order for my friends to compile my program on their Ubuntu system, I would tell them, after getting my source files, to just run: ...
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1answer
30 views

Creating .desktop launcher with QT_SCALE_FACTOR

I'm trying to create a launcher to replace this terminal command: QT_SCALE_FACTOR=2 /home/cozza/V-PlaySDK/Tools/QtCreator/bin/qtcreator I created the a .desktop nano ~/.local/share/applications/...
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Unable to install Airtel 4G LTE device (USB Dongle device) on Ubuntu 16.04(64 bits)

Recently I have installed Ubuntu 16.04 and trying to install Airtel 4G LTE device, but it's giving me following errors while installation Also shows no device at the end. But in files explorer, there ...
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Kubuntu - Edit width and padding of Icon-Only Task Manager Widget

I am using Kubuntu (18.10... however, it is almost same as 18.04). I want to edit width and padding of Icon-Only Task Manager Widget*. My desire is to have - larger font size, padding around each ...
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1answer
57 views

Facing problems installing Qt on ubuntu 16.04

I am following this link to install Qt on my PC. When I type sudo apt-get install build-essential g++ libqt4-core libqt4-dev libqt4-gui qt4-doc qt4-designer, I get this error: Reading package lists.....
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Can't run VirtualBox: Qt FATAL error

Qt FATAL: This application failed to start because it could not find or load the Qt platform plugin "xcb" in "". Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, ...
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Dropbox has stopped working on my 16.04 Ubuntu

Dropbox has stopped working on my 16.04 Ubuntu. When I try to start it in bash, this is the terminal output: work@work-HP-Pavilion-17-Notebook-PC:~ $ dropbox start -i Starting Dropbox...dropbox: ...
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How are Qt modules/classes distributed amongst Ubuntu packages?

For example, I know that I need the core dependency or the network one. In other words I have the following lines in qbs project file Depends { name: "Qt.core" } Depends { name: "Qt.network" } Now, ...
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I can't `make` OpenCV 3.1 (Ubuntu 18.04)

I'm trying to make OpenCV 3.1 after I generate the build with cmake-gui. I get this error [ 16%] Generating precomp.hpp.gch/opencv_core_Release.gch In file included from /usr/include/c++/7/bits/...
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1answer
142 views

Problem with qt5 while trying to run pgadmin4

I have ubuntu bionic upgrade from xenial recently. After the upgrade, I didn't find my pgadmin4 application, so I reinstalled it. After clicking the pgadmin4 icon, the program not shown. So I try to ...
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32 views

Uninstall old Qt Creator, keep the new one

When I execute Qt Creator from the Unity dash (Ubuntu 16.04) I find 2 versions of Qt Creator (I installed both of them): Qt Creator 3.5.1 based on Qt 5.5.1 Qt creator (community) 4.7.1 based on Qt 5....
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installation problem in texstudio in Ubuntu 18.04 [duplicate]

I installed texstudio from Ubuntu software. But when I try to run it, it doesn't open. I tried in terminal by writing texstudio and it shows an error like below: texstudio: error while loading shared ...
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308 views

Could not find or load the Qt platform plugin “xcb”: TexMaker

I am trying to run TexMaker on Ubuntu 16.04 LTS, but every time I try to do so I get the following error: This application failed to start because it could not find or load the Qt platform plugin "...
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How to use qt-speech in Kubuntu 18.04 (cli / Okular)

In Kubuntu 18.04 Okular can read any selection text, or the whole document by default. That is great, it is using qtspeech5 but How do I set the language? How can I use it from the CLI? Can't ...
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35 views

Slicer3D Expension Manager shuts down on Ubuntu 18.04

I am trying to use Slicer3D on Ubuntu 18.04. It used to work fine until yesterday, before I installed the updates for Ubuntu. Now, every time I try to open the "Extension Manager", the program shuts ...
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146 views

Some Qt apps (dropbox, megasync) stopped working

Just recently some of the apps I had to backup files stopped working and I do not know why. For example, at trying to start nautilus-dropbox or megasync I get errors related to the Qt library. See the ...
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1answer
1k views

Qt Creator not working on Ubuntu 18.04

I've installed the program Qt Creator using the package manager (Using sudo apt install qtcreator. After installing when I try to launch the program, it gives the following error message. qtcreator: ...
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2answers
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How to install and run a precompiled package on ubuntu 16.04

I am trying to install and run terracoin wallet on my ubuntu 16.04. The downloaded package comes with lib ,bin and includefolders. Inside the bin, there is terracoin-qt file that is supposed to launch ...
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2answers
2k views

How to update Qt from 5.5.1 to 5.9.5 on Ubuntu 16.04

Currently, Ubuntu 16.04 has Qt up to 5.5.1 while Ubuntu 18.04 has Qt up to 5.9.5. Currently I'm forced to use Ubuntu 16.04, however, I need to use a program that needs Qt 5.9. How could I update Qt to ...
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Contrast issue in text and background color on GTK-style menus

The text color and background color of (I believe) GTK-themed QT applications' menus is matching, making the text hard to read. What normally happens is that when the background is dark, the text is ...
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122 views

Launching a shared object executable on Ubuntu via double-click

I've built my application on Ubuntu using a static build of Qt in order to simplify deployment. I just noticed that if I double-click the executable, I get an error: Could not display "slate". ...
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1answer
142 views

How to launch my own compiled app in Ubuntu 18.04

I have compiled a GUI app using QT 5.11 in Ubuntu 18.04. The app works perfectly if launched from a terminal. I cannot launch it by double clicking it in Nautilus (it says no app is installed for ...
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2answers
99 views

How to run a specific version of Qt with Notepadqq

I have two versions of Ubuntu running on different VMs under VMWare workstation: 16.04 and 18.04. I really dislike the file open/save interface I have on 18.05 and I like the one I have on 16.04. I ...
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1answer
157 views

./openmw-launcher.i686: error while loading shared libraries: libQtGui.so.4: cannot open shared object file: No such file or directory

I've been trying to install OpenMorroWind for about 2 days now and this error just keeps popping up whenever i try to launch it. I've tried installing the LibQtGui.so.4 with apt install, but somehow ...
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vlc gui problems worst case crashes whole desktop cinnamon

I'm running an Ubuntu 18.04 with Cinnamon desktop. On 16.04 I used a ppa which delivered Cinnamon 3.8. After upgrading to 18.04 I first of used that further, until I had a themeing problem where my ...
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1answer
4k views

/usr/bin/x86_64-linux-gnu-ld: cannot find -lGL

This post has been translated from German. For the original, please see the revision history. I have written the following program in Qt Creator. The error message refers to Ubuntu. I'm using Ubuntu ...
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1answer
218 views

How Do I know if a software has KDE or GNOME dependencies?

I came to know that there are Desktop Independent Apps and Desktop Dependent Apps. In a Fedora forum thread Gnome vs KDE applications there is this: keep in mind the distinction between 'KDE apps'...
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1answer
253 views

Bash is not working fine on Lubuntu 18.04

When I run the command sudo bash or bash --version I get the following error: bash: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version 'Qt_5.10' not found (required by bash) The output of ldd is as ...
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1answer
689 views

VirtualBox will not install on fresh copy of Ubuntu 18.04

I've seen two questions which are similar to mine, but neither has solutions that work for me. When I try to install VirtualBox from the Ubuntu repos, the resulting program gives the error: ...
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1answer
100 views

How do i build a program with QTCreator, .pro file?

im sort of new to Linux and i'd like some advice on how to build CalcProgrammer on Ubuntu 16.04 LTS. (https://github.com/CalcProgrammer1/KeyboardVisualizer) It is an LED keyboard audio visualizer ...
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Virtualbox not launching on Ubuntu 18.04 - Qt lib problem

After doing a fresh install of Ubuntu 18.04 (using GNOME), I installed virtualbox both through sudo apt-get install virtualbox However, when I run it from the command line I get: VirtualBox: ...
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Qt Designer is buggy

I installed QT 5.11.0 on Ubuntu 17.10. I launched Qt Designer with ~/Qt/5.11.0/gcc_64/bin/designer. However, I cannot maximize the Designer window, I cannot drag and drop widgets, widgets change ...
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2answers
616 views

How Can I Update From QT 5.5.1 in Ubuntu 16.04

On Ubuntu 16.04, Qt 5.5.1 is included and used by default. How can I update the system so it uses a newer version, system wide by default (QT 5.7.1 for example)? Apparently there's a bug in 5.5.1 ...
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1answer
874 views

Qt/KDE camera app alternative to Cheese in Kubuntu 18.04?

The following additional packages will be installed: cheese-common gnome-desktop3-data gnome-video-effects gstreamer1.0-clutter-3.0 libcheese-gtk25 libcheese8 libclutter-1.0-0 libclutter-1.0-common ...
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101 views

Missing dependency 'already at newest version'

I have Ubuntu 17.10 and until yesterday I was able to run the Digiwage QT wallet without any problems. The wallet is just an implementation of the well-know QT wallet used for loads of ...
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1answer
200 views

Mendeley would not work after last Ubuntu Update

I have a mendeley running on Ubuntu 14.04.5. I am having issues starting the software now after an update a few weeks ago. I receive this error message: /usr/bin/../../opt/mendeleydesktop/bin/...
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262 views

How can I fix Qt apps texts & menus in ubuntu 18.04 bionic beaver?

QT is not cute in ubuntu 18.04 ! See below screenshots. I have the same issue with scribus and vlc. I tried deleting all config files that I know about, no change. I tried both qt4-config and qt5ct, ...
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1answer
366 views

Unable to locate package qt5-default in LXD container

I am trying to install Qt in a LXD container but the qt5-default seems to be missing. The LXD container is Ubuntu 18.04 based and I already installed the rest of the packages. Any ideeas? Thank you. ...
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2answers
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VLC 3 Won't Start

Version: VLC media player 3.0.1 Vetinari (revision 3.0.1-0-gec0f700fcc) Ubuntu 18.04 Error: cannot load module `/usr/lib/x86_64-linux-gnu/vlc/plugins/gui/libqt_plugin.so' (libQt5Svg.so.5: cannot ...
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1answer
44 views

Desktop file is not getting associated with application

I created a .desktop file for my Qt application, but it still doesn't becomes available in Dash, and default icon is getting displayed when I'm running it manually: [Desktop Entry] Categories=Network;...
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1answer
659 views

OpenCOR, “could not find or load the Qt platform plugin ”xcb“”

I'm trying to install OpenCor When I try to launch it I got this error message : This application failed to start because it could not find or load the Qt platform plugin "xcb" in "". Available ...
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1answer
557 views

Installing litecoin-qt in Ubuntu

Why can't I run the litecoin-qt file in the bin directory of the archive downloaded from litecoin.org? I copied it into the home directory and double-clicked, and also tried to to run it from terminal....
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1answer
258 views

Wireshark crash

While starting wireshark, I am getting following error: sudo wireshark This application failed to start because it could not find or load the Qt platform plugin "xcb". Available platform plugins ...
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0answers
59 views

QT based QUI application are messed up when using external monitor

All QT based application (I tested LibreCAD, Seafile, Okular, Wireshark (QT version)) does not display properly when using an external screen on my laptop! It miss most of the widget and the one that ...
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117 views

Compiling Qt 5 for Weston/Wayland on Ubuntu 16.04

I need to compile Qt to run some apps on Weston/Wayland native (X will not be running). I was following the instructions on this page on wayland.freedesktop.org, but problems quickly come up as soon ...
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1answer
280 views

How to make KDE applications look native in Ubuntu 17.10

Qt apps look out of place on my desktop. They use a different theme and color palate to the native GTK apps. Is there a way to get KDE/Qt5-based apps to integrate better by using the same theme as ...
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24 views

QT complains regarding GL library

Trying to build widget GUI application on QT on 32 bit Ubuntu. Qt shows error during build; cannot find -lGL collect2: error: ld returned 1 exit status How to fix this problem? What should be ...