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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.

About the Qt framework:

Links:

815 questions
84
votes
5 answers

What's the development package for Qt5 in 14.04

I want to build a Qt5 example on my desktop machine. I installed qt5-default and qtdeclarative5-dev, but I'm still getting this error: Project ERROR: Unknown module(s) in QT: quick qml Which package should be installed for compiling? In the Qt4…
marmistrz
  • 1,129
84
votes
17 answers

“Failed to load platform plugin ”xcb“ ” while launching qt5 app on linux without qt installed

I wrote application for linux which uses Qt5. But when I am trying to launch it on the linux without Qt SDK installed, the output in console is: Failed to load platform plugin "xcb". Available platforms are: How can I fix this? Maybe I need to copy…
locomotion
  • 941
84
votes
2 answers

What is KDE, GTK, GTK+, QT, and/or GNOME?

I'm new to Ubuntu (and Linux in general). Sometimes when looking at programs in the Ubuntu Software Center, I see things about the programs being 'for the GTK+ environment', or 'for GNOME', or a whole lot of other things. All I know is that I've…
HellHarvest
  • 973
60
votes
1 answer

Should I use PyQt or PySide for a new Qt project?

Recently I've been involved in conversations about creating a Quickly template for a Qt and QtQuick Ubuntu app. The idea is to make it as easy to develop Qt apps from concept to package as it is right now with GTK, on which the Ubuntu application…
David Planella
  • 15,610
53
votes
1 answer

Building Full Perl Support in Ubuntu SDK

I am running Ubuntu v14.04, and after some effort, I have successfully installed the Ubuntu SDK. I need to use Perl + QML/Qt to develop a (potentially large) number of fully-functional apps through the Ubuntu SDK, which can then run "convergently"…
Will Braswell
  • 639
52
votes
4 answers

What package do I need to build a Qt 5 & CMake application?

I'm trying to build sdrangelove, which wants Qt 5 and uses CMake for its build system, on Ubuntu 13.10. What package do I need to install to give it the file it's asking for here? There are a lot of *qt5* packages, and I've tried installing the…
Kevin Reid
  • 1,190
47
votes
5 answers

How do you install qt on ubuntu22.04

In ubuntu20.04 qt5-default was the package name. So I tried the same and qt6-default in 22.04. Then I tried apt-cache search qt which revealed (among many others): qt6-base-dev and qt5-base-dev. I am unsure whether the new qt{version}-base-dev is…
Natan
  • 1,059
45
votes
4 answers

How do I install and switch to the Unity 2D desktop?

I read that there is now a 2D version of Unity built on Qt. How do I install it, and once it's installed, how do I switch to it?
Jorge Castro
  • 73,717
40
votes
5 answers

qt5-default not in Ubuntu 21.04

I tried to install qt5-default but the package was not found. Of course, I read this question and added universe to the apt and done a apt update. I think qt5-default is not in 21.04 yet as it says here so how can I install, i need it.
Eduardo Procópio Gomez
  • 359
39
votes
3 answers

How can I install Qt 5.x on 12.04 LTS?

If you want to develop with QML 2.0 and Qt5, the base packages don't seem to exist in repository for 12.04. What PPA should I add? Is it a binary installer? a compile the toolkit yourself? Those aren't separate questions, they're just possible…
RobotHumans
  • 30,112
36
votes
4 answers

Why is Canonical choosing QT over GTK for Unity's next generation?

So much has been written that I'm kind 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 be migrated to qt. I just wanted to know the…
opensas
  • 3,257
32
votes
3 answers

What's the difference between GTK and QT?

Please bear with me as I'm a newcomer to Linux. I've been writing GUI programs in REALbasic on a Mac for several years. I'm trying to learn Python and I want to write GUI apps for Linux (primarily Ubuntu and Mint since they are the distros I have…
Nootrino
  • 657
31
votes
4 answers

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 utilizing Qt-Creator as IDE?
Ralf Hersel
  • 2,793
27
votes
5 answers

How to make Qt programs look good under Xfce?

I use Xfce. My problem is - some programs look nice and some sort of ugly. AFAIK this is because Xfce is GTK and most programs use GTK theme, but some programs use Qt and thus don't use GTK themes. So - my question is - How can I apply some theme to…
Stann
  • 15,416
25
votes
3 answers

qt4 / libqt4-* in Ubuntu 20.04

Ubuntu 20.04 dropped qt4 and all libqt4-* dependencies in its official repos. My knowledge about version conflict and install-breaking actions is limited, so before any unthoughtful action is taken, I would want the community's take about…
Daniel B
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