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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How can I integrate the menu of Qt applications into the top bar?

Example from VLC Media Player on Ubuntu 16.04.
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I installed kde-plasma and now QT fonts look horrible

I installed KDE-Plasma to give it a try, and everything went in the wrong direction. I've a hidpi screen, and it looks like KDE or QT is having lots of issues in understanding how to render fonts. ...
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QT Licensing - Commercial & Open Source [on hold]

for embedded development, is it necessary to purchase QT commercial license or the open source version is good enough?
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35 views

Installing Qt 4.8.6 instead of the Qt5

I am developing a project wrote from 4 years using qt4.8.6 but the default qt version now is qt5.. How to add qt4 to Qtcreator configuration kit be able to compile and run normally ?? I'm using ...
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How to install Qt designer for pyside development if you already have Ubuntu sdk?

I have ubuntu sdk installed on my machine. I'm interested in exploring pyside. Some of the pyside tutorials tell us to use Qt designer (I would like to). And I know it can run outside the Ubuntu SDK. ...
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28 views

Change qmake address ubuntu 14.04

I had installed the 32bit version of Qt but because it didn't work well (my system is 64bit), I uninstalled it using MaintenanceTool and installed the 64bit version. But now, when I run which qmake ...
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How can I keep bookmarks synchronised between Qt and GTK applications?

Does anyone know a solution to keeping the same bookmarks (red rectangle in the screenshots) between Qt-based and GTK-based applications? Qt-based applications: GTK-based applications:
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1answer
99 views

Running QML/C++ application build with CMake is unable to run from QtCreator or snap package

I am trying to get a QML/C++ application packaged as a snap. I am using CMake as a build system. The application builds fine and I am able to run the executable by double clicking on it. When trying ...
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58 views

Qt5 on Ubuntu 16.04 [duplicate]

I have followed this https://wiki.qt.io/Install_Qt_5_on_Ubuntu But when I try qmake --version qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory I usr/...
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42 views

Ubuntu Touch Development - first steps in cross-compiling and installing?

I have a bit of home-built C++ code using Qt that I run on my Ubuntu Desktop, and I've been fooling around with the Aquaris M10 tablet running Ubuntu Touch for a while... I got to thinking, I'd really ...
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How can i build an ubuntu touch app only in c++ (without qml) and with cmake

is there a way to configure a cmake file for building a click-package without qml. i like to start programming in the main function with QApplication and only my own window class. my goal is to write ...
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1answer
43 views

Develop a Snap package for project using SDL2

I am currently developing an application that uses joystick input and generates different wave sounds using SDL. While the implementation works without any issues, once I package my application using ...
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36 views

QT unmet dependencies for smplayer

I was trying to upgrade smplayer, but aptitude tells that it's unable to solve the dependencies for libqt5script5 $>sudo aptitude dist-upgrade The following NEW packages will be installed: ...
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37 views

Can't figure out Cmake [closed]

I don't have much experience with Cmake and setting environment variables/paramaters, mainly because I've never needed to, things usually compile themselves. I'm trying to install heimdall. And i'm ...
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30 views

QtCreator error with qtversion Ubuntu 16.04 [duplicate]

i installed QtCreator in Ubuntu 16.04 with: sudo apt-get install qtcreator Then is opened qtcreator to start a project but i have this error: qtcreator error Ididnt installed anything related to ...
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2answers
630 views

What is the default icon set in Ubuntu 16.04?

I would like my Qt configuration to match the default Ubuntu 16.04 style. What is the default icon set from the below list of icon sets?
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21 views

Ubuntu SDK with existing Qt installation

I have an existing Qt installation and I want to try Ubuntu SDK. I was wondering if there is a repository which can be added into the Qt Maintenance tool and install the Ubuntu SDK from there so I can ...
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19 views

KDE Framework 5 qtcurve window background transparency

I am running Ubuntu 16.04 with KDE framework 5 on a machine with an AMD gpu and the open source drivers. In KDE, I've tried using qtcurve but I can't seem to change window background transparency-- I ...
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1answer
135 views

QtCore not found

I have problem regarding installation - when I want to compile KeePassX with cmake there is error with QtCore. I tried installing libqtcore, I got E: Unable to locate package libqt4-core Output of ...
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1answer
135 views

Ubuntu SDK : Having difficulty getting images to work in 'QML only app' when deploying to armhf device

When I deploy my QML only program to the desktop using the Ubuntu SDK, images that I have placed in the same folder as 'Main.qml' can be accessed and displayed correctly in the application using ...
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2answers
75 views

Qt5 apps won't open on one computer

There is a Qt5 app (Musescore), that I am trying to get to work on my second Ubuntu computer. On my main computer (Lubuntu 16.04), Musescore works fine, but on my second computer (also Lubuntu 16.04),...
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1answer
33 views

How to add qt qmake version 4.8 to qt creator?

I have Qt creator 5.4.1.I have qmake 5.4.1 but I wan to add qmake 4.8 for desktop version.How could I do? I install gcc4.8,but I don't know Is qmake install?(if it installed so where was it?) root@...
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Ubuntu GNOME and high resolution screen: icons in QT apps are too small. How to solve?

my brother got a new laptop, a Thinkpad X1 Carbon 4th generation. It features a screen with a rather large resolution of 2560x1440 px. Out of the box, GNOME scales well the size of the text and the ...
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49 views

How do I enable global menu for RStudio in 16.04?

I tried the solutions mentioned in this question but neither worked. RStudio version 0.99.896 on Ubuntu 16.04.
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1answer
90 views

How to update Qt from 5.2.1 to > 5.5

I am trying to install an application that requires qt 5.5 or higher. I think that I have just about downloaded the Internet, and still it shows 5.2.1. andrew@andrew-Aspire-E5-574:/usr/lib/x86_64-...
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How to install libqt4-core and libqt4-gui on ubuntu 16.04

Upgrade to 16.04. But the libqt4-core and libqt4-gui packages are missing. How could I install them on 16.04? Thanks.
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38 views

Ubuntu SDK unable to play scope

I've just created a Unity Scope project in Ubuntu SDK. However I'm not able to run it, If I target the Desktop, I have the following error : Starting /usr/ubuntu-sdk-ide/share/qtcreator/ubuntu/...
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1answer
217 views

How to get an uniform look for Qt and GTK applications in xenial

Since I upgraded to xenial all the applications but the ones using Qt4 look uniform. For some reason the Qt4 applications like SpeedCrunch or Okular use the Plastique theme by default. The Plastique ...
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1answer
41 views

How to check Qt is working or not

I installed Qt version 4.8.5 in my ubuntu machine and how can i test a sample program. Can anyone provide me a sample .pro file and .cpp file ? or the sample of needful files to test Qt ?
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1answer
233 views

How to install Qt 5.x 32 bit on 64 bit ubuntu/debian?

How to install Qt 32 bit and correctly build an application on 64 bit ubuntu/debian? Are there i686 or 32 bit packages like in SUSE? Which repositories?
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1answer
84 views

I can't compile a Qt project

I was trying to compile a project I checked out from github but I get these errors: /usr/bin/ld: cannot find -lQtGui /usr/bin/ld: cannot find -lQtNetwork /usr/bin/ld: cannot find -lQtCore It worked ...
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1answer
105 views

How to install Qt verion 4.8.1

How can i install Qt version 4.8.1 in Kubuntu 14.04 ? I cannot find the version 4.8.1 in the official Qt site's downloads list. Kindly help me to install the exact version. Thanks
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Qt related build error when installing v4l-utils 1.10 from source in Ubuntu 14.04

I tried to install v4l-utils version 1.10.0, but encountered build errors. I'm using Ubuntu 14.04 32bit. I ran following commands in the terminal: cd ~ tar -xvf v4l-utils-1.10.0.tar.bz2 cd v4l-utils-...
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Installation issue fatal error: QtOpenGL/qgl.h: No such file or directory

What madness is this? Tried installing icub simulator from sources and when compilation reaches 54% then this madness happens. /icub-main/src/tools/iCubGui/src/animationview.cpp:35:0: /home/zzz/...
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Application GUI shriking in ubuntu 14.04

I have written an application in Qt and when i have executed it the appearance of application is varying from desktop to desktop both the desktops are containing same version of OS i.e Ubuntu-14.04 ...
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Unable start qt creator on ubuntu

I did install qt creator in ubuntu 14.04 using Ubuntu software center, but whenever i click on icon it just flashes but will not start, can please someone tell me the solution so that i can fix this ...
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82 views

QML unit testing: running qmltestrunner

I'm on ubuntu 14.04. I installed the Ubuntu SDK IDE. Running a QML App on my Ubuntu phone via the IDE works fine. I'm following this tutorial on testing https://developer.ubuntu.com/en/apps/qml/...
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1answer
119 views

Building qBitorrent with qt5 fails (qt4 works)

I want to build qBittorrent v3.4.0alpha with qt5, but I'm getting errors. In this qBittorrent version qt5 is the default, but running ./configure --with-qt4 && make builds it using qt4, which ...
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81 views

install ubuntu-sdk ubuntu 14.04LTS

I am trying to install ubuntu-sdk. (http://developer.ubuntu.com/en/start/ubuntu-sdk/installing-the-sdk/) In ubuntu software center I receive this message: The following packages have unmet ...
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99 views

Configure git with QtCreator

Ubuntu 14.04 LTS, QtCreator 3.0.1 based on Qt 5.2.1, Git 1.9.1 I'm trying to configure QtCreator to work with git. I was able to create local repository, but I cannot add current project to it. ...
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146 views

Can QT apps scale up nicely for UHD/HDPI/4k displays

I've got a laptop with a 4k screen. Yes I know its silly but it's very nice for photo editing :-) Gnome/GTK apps work pretty well. There's a HDPI scale factor that you can apply that makes everything ...
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97 views

how to change opencv configrations in cmake to support qt

I'm new to opencv. I installed it on my computer using cmake following the tutorial in their website. mkdir Desctop/opencv cd Desctop/opencv git clone https://github.com/Itseez/opencv.git cd opencv ...
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1answer
464 views

qtcreator 3.5.1 (Qt 5.5.1) crashes on Ubuntu 14.04, VritualBox Could not initialize GLX Aborted (core dumped)

I just installed Qt 5.5.1 on Ubuntu 14.04LTS under VirtualBox 5.0.14. I can't runt Qt Creator, after a long list of warnings at the end it prints Could not initialize GLX Aborted (core dumped) ...
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42 views

Qt5.3.2 could not read symbols

My environment. OS :win7 32bit. VM :5.0.14. Ubuntu:12.04 LTS 64bit. cross-compiler:arm-linux-gcc 4.3.2. Qtcreator:5.3.2. I just cross compiled opencv-2.4.9 and make install . I have added ...
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error when installing the required packages from the link https://techbase.kde.org/Projects/Edu/KStars/Building_KStars_KF5:

rahul@rahul-Latitude-E6410:~$ sudo apt-get install build-essential cmake git libeigen3-dev libcfitsio-dev zlib1g-dev libindi-dev extra-cmake-modules libkf5plotting-dev libqt5svg5-dev libkf5iconthemes-...
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1answer
81 views

Plugging/configuring second monitor causes logout

When I plug additional screen to my laptop while running OS there are mainly no problems, but: When I move one of screen to the other side of the second one in system settings, system logouts ...
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1answer
91 views

Can I run any other display server on Ubuntu Core, except for MIR?

What are the options to run QT applications on Ubuntu Core ? Should I use docker or are there snapcraft frameworks available for using EGLFS or Xorg ? The hardware platform that I am using is Intel ...
3
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158 views

could not find or load the Qt platform plugin “xcb” in ubuntu-sdk

Command: $ ubuntu-html5-app-launcher --www=www Error: This application failed to start because it could not find or load the Qt platform plugin "xcb". Reinstalling the application may fix ...
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34 views

record float variable in sqlite

My sqlite db has a table and I want to record a Float variable in my database but after execution my command just records a square in the table. QString new_table = "logs_2"; qry_table.exec("CREATE ...
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28 views

Error loading libQt3Support.so.4

I am trying to install this software called Vlab. Its a Plant modelling software. I am following their instruction to install their software. After that if i run the command vlab-splash which ...