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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Symbol lookup error: /usr/lib/i386-linux-gnu/libQtOpenGL.so.4: undefined symbol: _ZNK14QWidgetPrivate17hasHeightForWidthEv

I installed skype using several process in my newly installed Ubuntu 14. 04 64 bit... it shows a skype icon in dash... but when I click on it, nothings happens. What can I do? I tried almost ...
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Multitouch in Qt

I've got a fresh install of Kubuntu 14.04 and Qt Creator/5.2.1, and I'm trying to get multi-touch working for the example applications like photosurface. My input device is an Acer T272HL 10 point ...
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Ubuntu 14.04 and 13.10 trouble installing apps

Hi have started using Ubuntu 13.10 about a month ago first time user, like it very much after playing around with different softwares like Draftsight, qt sdk virtualbox each one of these where ...
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Can't change keyboard layout in some Qt programs

The problem after a recent update in my Ubuntu 13.10 with Unity. When typing something in Qt Creator 3.0.1 or in my own program compiled with Qt 5.2.1 (from qt-project.org), I can't change keyboard ...
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What is the difference between Ubuntu.Components and QtQuick?

QtQuick 2.0 Ubuntu.Components 0.1 Are two common imports when developing applications for Ubuntu. Are these classes? Can you import member functions this way? If yes, how can tell what member ...
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QT theme in Clementine in 13.10

I have a strange problem with QT theme in Clementine. When it is run from sound menu (notification area), it has Windows classic theme: When it is run from terminal or Ubuntu menu, it looks OK: ...
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Using KDE - Application Menus Missing in Qt Apps

I have multiple desktop environments installed on my Ubuntu 14.04 installation, and am primarily using KDE (today). Here's the problem I've noticed. When I've been building some newer versions of ...
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QML: Simplest way to write to a text file?

QML at the moment lacks basic system commands, so I am looking for the most simple template to write to /tmp/text.txt. Here is a starter: import QtQuick 2.0 import Ubuntu.Components 0.1 import ...
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Change tab from code using ubuntu SDK

How to change tab using code in QML in Ubuntu SDK? The answer is: If tabs are defined as follows: Tabs { id: tabs ..... } then using this: tabs.selectedTabIndex = 0 will get ...
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Use SystemSettings 1.0?

I'm developing a new app that I need to use the SystemSettings module for (I need to get the device serial, IMEI and stuff). When looking for a way to get these numbers I came across Ubuntu System ...
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Difference between Qt Creator and Ubuntu SDK?

Having downloaded them both when I installed the Ubuntu SDK, I wonder if there is any tangible difference between the two, such as the libraries being employed.
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Why wouldn't sound be heard on the phone when it works on the desktop with an Ubuntu Touch app?

I have an Ubuntu Touch application in the works. The application needs to playback sound. I've used QtMultimedia from C++ for sound playback. The sound plays fine on PC but not on the phone. The odd ...
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Cannot import directory path to qmlscene

I am trying to import directory in QML as explained, here: http://qt-project.org/doc/qt-5.0/qtqml/qtqml-syntax-directoryimports.html. I have the following ubuntu-app | - extras1 | - extras2 | - ...
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Downgrade qt in Ubuntu 13.04

I use Ubuntu 13.04. Does anybody know how to downgrade qt to the version 4.8.2?
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Import libraries in Ubuntu SDK

I am very new to QML, Qt and the like. I want to add a library (e.g. http://sourceforge.net/p/qzxing/wiki/Home/) for a "Ubuntu -> Simple UI" project. However, I cannot figure out how. The instructions ...
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apt-get install <package> equivalent using C++ apt-pkg library

I am building a small QT (C++) application where I ask user the software he want to install. Once he selected some packages a, b, c from the list all I have to do is run sudo apt-get install a b c ...
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How do I fix X problem to invoke Cadence IC6.10 in Ubuntu 13.10

I installed Cadence IC6.10 in my Ubuntu 13.10. When I tried to invoke the Cadence, I got the following error message: ============================================================= Qt Warning: X ...
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1answer
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How do I add a qrc file to my Ubuntu Touch qml project?

My UT QML project makes use of a set of images, and I was planning use them via "qrc:///pathtoimages/myimage.png" style of url. In Ubuntu SDK, I can "add new... Qt / Qt Resource File". The file is ...
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ListView doesn't appear

I'm working at app for ubuntu touch. I have a code with listView in it. But when I run it the page is simply empty (tehre is a title and a tabs switcher). Where is the mistake? import QtQuick 2.0 ...
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Appmenu with QML App

I'm developing an Ubuntu SDK meant to be used on both the desktop and touch interfaces. Obviously the menu that slides up from the bottom of the window is not a great interface for the desktop. ...
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1answer
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Qt5 installation and path configuration

I have installed Qt5 from the Qt5 project site, to the following directory /opt/Qt5 I would also like to mention that I had Qt4 installed previously, I have removed all instances of Qt4 through ...
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1answer
84 views

How to detect events like lock/unlock screen, enter/return suspend and monitor power off

I am wondering if there is any way to detect system wide events under linux such as: user un/locked session user logs in/out machine sent to suspend screensaver goes on and the monitor switches off ...
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Problem installing QtOctave

First I installed MATLAB and I got stuck here: No MATLAB executables were found in the directories you specified. This package requires at least one local installation of MATLAB. I was unable to ...
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What's the best way to make a Qt executable program run as a service in Ubuntu

I've written my Qt code for an embedded system which is running on Ubuntu. I want to run my program as a service in Ubuntu so I can stop or start it using monit. I've seen some people creating a new ...
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How to set a default file manager for qt's app?

I am running on ubuntu with awesomeWM which does not have specific file manager. When I launch vlc or any other Qt app and try to open a file from there, it does segfault after the following error ...
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Cant install unixodbc-gui-qt_2.3.0 on Ubuntu 13.10, complains “cannot find Qt!”

I am on Ubuntu 13.10 and I am attempting to install UnixODBC GUI, the instructions look straight forward. When I run ./configure I get an err "configure: error: cannot find Qt!". I have installed ...
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QT creator tutorial: Itemstyle invalid

Running the Currencyconverter tutorial "itemstyle" in the following line is underlined with red: ItemStyle.class: "title" with an error "invalid property name" How to fix this error?
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Ubuntu 12.04 LTS - installing Qt 4.8.5 and Qt Creator

I found the official guide about how to install Qt 4.8.5 on Ubuntu 12.04 But that approach requires building Qt SDK (which may take some time) and setting everything manually. Moreover I need also ...
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1answer
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How to put MainView into maximized

[using ubuntu sdk to write an application for the desktop] Is there a way to change the window state of the MainView? MainView { ... width: units.gu(100) height: units.gu(75) Page ...
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How to use Qt Creator with Python?

I want to use Qt for developing Ubuntu desktop, phone and tablet applications but I don't want to learn a new programming language (C++, JavaScript). Is it possible to write Qt application in Python ...
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How to call Qt or local function from Ubuntu HTML5 App?

I have create a HTML5 App from Ubuntu SDK. It contains a index.html and js directory. Next I add "X" label on the html file like this: <head> ... <style type="text/css"> ...
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qml file and app.js not found

I am a newbie in ubuntu app development. I am going through the tutorials in developer.ubuntu.com. The thing is when I created a sample ubuntu-htmui project, no .qml file is being created as explained ...
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how to install both qt5-qmake and qt4-qmake

There is no qt5-qmake on default LTS 12.04 repository so I am using ppa from ubuntu-sdk-team ppa:ubuntu-sdk-team/ppa However since this or previous month, it stopped working to me. Now when I try to ...
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Compile Qt3-program on KDE4

I want to compile a program (KTIGCC), but it is intended to be used on KDE3, using Qt3 libs. Is there any possibility of compiling and using this program in my current KDE4? Trying to run ./configure ...
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Can't Set Environment Variables in ~/.profile

All, I need to set environment variables in my ~/.profile since I am running a program (QtCreator) that doesn't start a bash shell. I cannot for the life of me get it to work though. QtCreator will ...
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QGtkStyle was unable to detect the current GTK+ theme

When I start any Qt app, I get this message in the terminal, and the Qt app doesn't use the same theme as my Gtk apps: QGtkStyle was unable to detect the current GTK+ theme. How do I make QGtkStyle ...
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How to install qt 4.8 from repository?

How to install qt 4.8 and QtCreator from repository ?
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Missing package in Ubuntu SDK - qtdeclarative5-ubuntu-webapps-api

Installing the Ubuntu SDK failed because of missing package qtdeclarative5-ubuntu-webapps-api this was the message from apt-get: The following packages have unmet dependencies: ubuntu-html5-sdk ...
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qDebug() output is not visible on a terminal

I use UBuntu 12.04 LTS. When I run a console application using Qt Creator an output of qDebug() is not visible on a terminal (I get only an empty terminal with a cursor). How to fix that ?
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Minimal package to install Qt Assistant

We are using Qt Assistant as our help system for a custom application that will run on Ubuntu. In building the .deb package, I need to include a "Requires:" value that makes my package dependent on ...
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QT 4 update, removing lots of libs

I get a message from Muon update module aksing to update QT 4. Thats fine, but it also want to remove LOTS of libs and programs (incl spotify, ksystemlog, krdc, krfb, kdepim-runtim, userconfig and ...
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1answer
275 views

how to write characters to serial port

I have an ancient serial spectrometer which only runs on win9x. I want to convert to a Linux system, but the existing software is proprietary and wont work. I was able to access a console internally ...
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Error installing Qt4 on Ubuntu 11.10 ARM [closed]

I'm working on a Nitrogren6x ARM platform. They provide an image based on Ubunu 11.10. This works like expected and I don't want to upgrade to some newer Ubuntu version. We are trying to run some Qt4 ...
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1answer
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How do I get ~/.XCompose to work on QT applications while using Ibus?

I'm trying to use ~/.XCompose in Qt programs like Anki, but they don't recognize my settings (a + _ giving ª instead of ā, for example). Most help guides online tell me to set QT_IM_MODULE to XIM, ...
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1answer
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dogecoin wallet client dependencies (boost)

I seem to be missing something boost related. Dogecoin gives the requirements as: qt4-qmake libqt4-dev build-essential libboost-dev libboost-system-dev libboost-filesystem-dev ...
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Why is canonical choosing QT over GTK for Unity's next generation?

So much has been written that I'm kinf of confused, but if I'm not mistaken Canonical is building the next generation of Unity for mobile devices with Qt, and in the near future the desktop will also ...
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How to install QtMultimedia source?

I need QtMultimedia to compile an open-source project. But it wasn't installed with qt. I've tried sudo apt-get build-dep qtmultimedia5-dev But it doesn't find such a package. I've downloaded it ...
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Package ubuntuone-control-panel-qt isn't available

Just installed Ubuntu 12.04LTS 64bit and I'm setting up Ubuntu One, but it wouldn’t let me. Package ubuntuone-control-panel-qt isn't available There isn't even any more available information. ...
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Qt QML modules, how to import them and know what to import & QtMultimediaKit 1.0

In the last question, (How to insert Video element in my Ubuntu application?) I thought that I could create the Video element with the QtMultimediaKit1 . But I tried to import QtMultimediaKit 1.0 and ...
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Autokey (autokey-qt) freezes and won't insert text

Per some suggestions on here and lifehacker, I began using autokey. It worked great for a week, but as of today it now hangs when I try to enter name new phrases. usually won't close when I push ...