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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Ubuntu SDK Design

OK, so i have a question, i don't know if it's me or others, but i would like to know when or is the design mode going to be fixed?? "import Ubuntu.Components 1.1" for example. I tried, the ...
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QT version update

I'm running Ubuntu 12.04 and I've noticed that the system Qt libraries in /usr/lib/... have the version 4.8.1. Now this version of Qt is quite old and many important updates and bugfixes have been ...
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“error: cannot find -lGL” in Qt creator 5.5.0 on Ubuntu 14.04 LTS

I am trying to build and run a sample program on Qt creator 5.5.0 and Ubuntu version is 14.04 LTS. Every time its giving an error cannot find -lGL and id returns exit 0. I tried to resolve this ...
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How can I specify a Qmake file during packaging?

I'm trying to package a piece of software that I wrote for Debian/Ubuntu. I've read that dh supports Qmake natively. However, my .pro file is not in the root directory of the source tree, but rather ...
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ddc card with Qt

Does anybody knows about ddc device working in Qt5, which is used in avionics with 1553 communication. I tried to access the DDC(data device corporation)device for 1553 mil-std communication in Qt to ...
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What is the correct way of using Qt 5.4 in my .deb package?

I want to create a .deb package for an application that I am working on, which depends on Qt >= 5.4 For some supported versions of Ubuntu this version is not available except via packages from a ppa. ...
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Cannot start Qt Creator after updating to 15.04

My Qt Creator (from ubuntu-sdk) won't start after updating to 15.04. It gives this dialog after the window has opened: [3]+ Segmentation fault (core dumped) qtcreator Also I don't ...
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Could NOT find Qt4: Found unsuitable version “4.8.1” BUT i have version 5 installed?

I'm new to Ubuntu, and trying to run cmake. When I run the command: cmake ../src I get: CMake Error at /usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message): ...
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How to build Qt from source with not default version of gcc compiler?

P.S. The problem is solved. It has nothing to do with Ubuntu particularly, of course. One needs to manipulate with paths to gcc versions using "update-alternatives" command ...
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42 views

QtWebSockets not available on Ubuntu Touch

I'm developing an Ubuntu Touch application which communicates with a server using WebSockets. Qt offers its own API since version 5.3, which can be used from a QML file by adding import QtWebSockets ...
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24 views

Qt Creator fails in designer tab

Qt Creator in designer tab displays black frames. At the same time in Konsole I have the following message several times (more than 30 times): QQuickWidget cannot be used as a native child widget. ...
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1answer
26 views

Cannot detect if a MouseArea is over a GridView item

This question is not specific for the Ubuntu platform, but as I am developing an Ubuntu Touch app, I'd like to ask first here. I have a list of UbuntuShapes arranged in a GridView - generated from a ...
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32 views

Serial port blocked. How can I detect what it is?

I am using Qt (QSerialPort) to handle the port. At startup, I am attempting to open the port every second. It takes in average 12 cycles not to get back an error, which is: ...
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14 views

Running QLandkarte GT on 1024x600 resolution

When I start QLandkarte I found that it has no maximize/minimize/close buttons on right window corner and it fits uncomfortable in 1024x600 resolution screen. QLandkarte window don't fill screan width ...
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24 views

How to get and install qt header and libraries in specific folder?

Where do I get qt header and libraries from? And then how do I install qt header and libraries in specific folder?
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1answer
33 views

Cannot execute QT console program in ubuntu [duplicate]

An error occurred. Starting /media/milo/DATA1/Milo/C++/build-test-Desktop-Debug/test... Cannot execute '/media/milo/DATA1/Milo/C++/build-test-Desktop-Debug/test': Permission denied ...
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9 views

Problem compiling with QT4 libraries in pbuilder

I am having trouble getting pbuilder or launchpad to build a package that uses the QT4 libraries. The build script that I am using is below ( I didn't write it ). It compiles fine on a vanilla ...
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1answer
62 views

Use g++-4.8 with Qt

I am trying to compile a Qt project that uses the "override" keyword, and thus needs GCC 4.8. I have installed GCC 4.8 on my Ubuntu 12.04 machine already, and it lives in /usr/bin as gcc-4.8 and ...
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34 views

Ubuntu 15.04: Change KDE application's icons

is there a way to change the icon theme that is used by KDE applications like Krusader in Unity? KDE systemsettings don't work any more. Can't I just edit some file? Thanks
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54 views

Static QT libraries for Ubuntu 14.04

Is there a package which contains all static QT 5 libraries? There are only some static libraries in the qtbase5-dev package (and its dependencies). To be more precise, the static versions of Qt5Test, ...
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40 views

Adding qt4 and qt5 to global path

I have downloaded a source code from github. It is using qt and in many files it has the following headers included: #include <QApplication> #include <QApplication> #include ...
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Focus Writer 1.4.4 has an error when I type in Korean

$ focuswriter QGtkStyle was unable to detect the current GTK+ theme. QString::arg: Argument missing: "문단: % L1" , 0 QString::arg: Argument missing: "문단: % L1" , 0 QString::arg: Argument missing: "문단: ...
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189 views

Unity desktop on Raspberry Pi 2

The first thing needed to make it work is a driver. There was a Mesa and DRM driver for Broadcom VC4 developed recently by Eric Anholt. It's an OpenGL driver. http://dri.freedesktop.org/wiki/VC4/ ...
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CoverFlow app for Screenshots

Does anyone remember how the tiny little KDE/QT tool to create stylish (reminiscent of iTunes' CoverFlow effect) screenshots with reflections? One could select some screenshots (or other pictures) and ...
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Virtual box crashes with undefined symbol

When executing Virtual Box through GUI doesn't pop up anything using terminal it crashed with error: root@mayur-laptop:/home/mayur/Documents/MyOs# virtualbox VirtualBox: ...
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File access outside application directory

I want to know is it possible to access files outside the application directory? e.g. /home/phablet, /media, etc. Okay, so precisely I want to use QDir and QFile to read the folders and the files ...
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47 views

disable automaic update for texmaker [duplicate]

I'm new to Ubuntu 15.04 and I experienced problems with Temaker, namely the keyboard shortcuts did not work after some time. However, manually installing the version compiled with Qt4 fixed the ...
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99 views

KDE/QT applications on Xubuntu 15.04 are horrible

All installed KDE/QT applications on Xubuntu 15.04 are horrible (clementine, digikam, etc...). I think the layout miss all kde/qt library. See there http://postimg.org/image/ng087lkkb/ Why? How can ...
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78 views

Problem with installing Qt5.3

I am trying to install Qt5.3 into my Ubuntu 14.04(64 bit). While installation process was running suddenly it was showing some prompts and showed several error messages as following: Error during ...
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1answer
20 views

How to add packages installed manually to the system's package database?

I installed QT Creator by off-line installer in Ubuntu 14.04 and now i want to install Ubuntu SDK but it still lists QT Creator as software that need to be installed in the system. Ubuntu Software ...
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150 views

How to make Qt apps use GTK+ style in Xubuntu 15.04?

I'm using Ubuntu 15.04 right now, and Qt apps like qBittorrent and Clementine looks like they were GTK+ apps, they use the systems icons and style. But I installed Xubuntu in another PC and doesn't ...
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ubuntu licence for commercial apps

I want to submit a commercial application in ubuntu software center... in publish process there is a part that ask licence file (list of numbers) First, what is the syntax of this file? Second, how ...
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63 views

Ubuntu Phone - detect system type Desktop or Mobile

Is there a way to detect platform from QML or Qt C++ classes? I have Qt/QML project supplied to Linux/Android/Windows at one time, I see it's possible to deploy it to Ubuntu Phone. Is there a way to ...
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161 views

How to install PyQt for python3 in ubunt 14.10?

I found some tutorials online for earlier versions of Ubuntu but they didn't seem to work on Ubuntu 14.10, either that or I was doing it the wrong way, I want to use QtDesigner to design a GUI, use ...
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276 views

Ubuntu 12.04 - Install newer libqtwebkit4 instead 2.2.1 for ScudCloud

I am trying to install ScudCloud, but it requires libqtwebkit4 version 2.3.2 or greater. Unfortunately, in Ubuntu 12.04 the latest version still remains in 2.2.1. Is there a PPA or an alternative ...
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1answer
119 views

How to make and application for Ubuntu phone OS in QT creator? [closed]

I want to develop and application for Ubuntu Phone os. How to do this in QT creator? Is it really possible to create an app for ubuntu phone os? or is does the Ubuntu phone apps made in the same way ...
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167 views

Ubuntu 14.10 : Qt5 assistant not found

I am working on a system running Ubuntu 14.10 in which I have started programming on Qt5. Before for few months when I was working on Qt, I found that that QT-assistant tool really comes in handy. I ...
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1answer
99 views

Building ubuntu touch app with sql (mysql) support problem

i`m trying to develop simple ubuntu application. This application should connect to remove mysql server, query and display data in UbuntuListView. Project was created in Qt Creator 3.1.1 as QML app ...
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67 views

marble-touch offline map viewer fails to start

Ubuntu 14.04 with Unity, marble-touch 4:4.13.3-0ubuntu0.1. It doesn't start: $ marble-touch qrc:/main.qml:13:1: Type MarbleWindow unavailable qrc:/MarbleWindow.qml:11:1: module "com.nokia.meego" is ...
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166 views

Program[Digikam] chooses wrong qt lib and crashes

I run Ubuntu 14.04 64bit. Digikam used to work but recently stopped working. I was wondering if someone could help me work a way to resolve this issue. I've had a response from the Digikam mailing ...
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171 views

Installing libgl1-mesa-dev gives unmet dependencies

I am using Ubuntu 14.04 sudo apt-get install libgl1-mesa-dev When I try to run this command I get: The following packages have unmet dependencies: unity-control-center : Depends: libcheese-gtk23 ...
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60 views

How to cross compile the qtmultimedia-opensource-src for armhf?

Repost from https://answers.launchpad.net/ubuntu/+source/qtmultimedia-opensource-src/+question/264619 Cross I can't figure out how to build it with cross compiler (on trusty-amd64 for ...
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How can I get menu items in a Qt Quick application?

I'm using Qt Creator 3.1.1 on Ubuntu 14.10 (the version installed when you install Ubuntu SDK - the two seem to be the same application). I'm running the default Unity 7 desktop. When I create a new ...
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1answer
79 views

QAxObject: No such file or directory

I have created a QT 5 Console Application for read an xls file, but when I include QAxBase and QAxObject header files it gives me following error: error : QAxObject: No such file or directory My ...
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1answer
88 views

Qt Multimedia doesn't seem to work on Touch

Using Qt package 'Multimedia' to get cameras on the bq phone: QList<QCameraInfo> cameras = QCameraInfo::availableCameras(); cameras.size() always returns zero. Host 14.04, target 14.10, Qt ...
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193 views

How to remove in correct way qt4 development libraries?

Since I am using Qt5 stuff which installed in /opt directory and about to install Ubuntu SDK seems like Qt4 packages will be redundant in my system. Moreover I am not in need exactly Qt4 libs. So how ...
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Errors installing capybara-webkit

I'm trying to install capybara-webkit, I've installed QT already, and purged + reinstalled qt and ruby after that didn't work. Building native extensions. This could take a while... ERROR: Error ...
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128 views

How to cross-compile a Qt package for armhf with sbuild?

I have a Qt application that I would like to cross-compile for armhf. I've set up an sbuild chroot using the following command: mk-sbuild --target armhf trusty However, when I run debuild -S and ...
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138 views

Error while trying install QT4 on Lubuntu 14.04.2

I'm trying to install QT4 on my laptop that has a new installation of Lubuntu 14.04.2 but I keep getting this error dpkg: error processing archive ...
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423 views

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

I am getting this error when I tried to run APK Studio in my Ubuntu 14.10 This application failed to start because it could not find or load the Qt platform plugin "xcb". Available platform plugins ...