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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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
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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 ...
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1answer
26 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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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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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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2answers
3k views

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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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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How to install libQtGui.so.4 32bit on 64bit ubuntu

I am trying to compile the android tree on Ubuntu 64bit 12.04; The build fails on an error of missing shared library libQtGui.so.4; Check /usr/ lib files i found that: /usr/lib/ or /usr/lib32 doesn't ...
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1answer
138 views

Qt Audio Engine not in Ubuntu SDK

I am using Ubuntu 14.04. I installed Ubuntu SDK with no problems using the instructions on Ubuntu website. I created a new QML project. I want to create an app that uses Qt Audio Engine. Here is my ...
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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 ...
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53 views

Unable to re-install ubuntu-desktop, or fix the broken packages required to do so

I don't know how, but somewhere along the way the package ubuntu-desktop got uninstalled from my machine. I'm starting to notice little breakages all over my system now- I can't upload photos from ...
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3answers
12k views

Where does apt-get install libqt4?

I've been searching for literally hours and I cannot figure out where for the life of me libqt4 is installed by apt-get. I installed: libqt4-dev libqt4-core libqt4-gui libqt4-xml libqt4-opengl ...
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33 views

Can I submit my non-free closed-source Qt application to Ubuntu Software Center without providing sources?

I don't want to provide sources of my application. Can I submit it as deb package or other way?
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49 views

Unmnet dependecies while installing libglu1-mesa-dev -y for Qt OpenGL support

I am trying to finish Qt installations steps but unfortunately when I try to install libglu1-mesa-dev -y I see following problem: majer@majerPC:~$ sudo apt-get install libglu1-mesa-dev -y Reading ...
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2answers
153 views

QT Creator wants me to remove many programs before I can install it via Ubuntu Software Center

I've just upgraded my Ubuntu-gnome version from 14.04 to 14.04.02 and somehow I lost my QT Creator software which I commonly use to do my coding. I decided to install it again. When I tried to ...
3
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1answer
505 views

Qt4 interface not working for VLC

This is what happens if I try to run VLC: main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. main interface error: option qt-volume-complete does not exist ...
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3answers
3k views

Missing documentation for Qt5 on Ubuntu 13.04

I use Qt Creator for building applications and recently I decided to upgrade my Ubuntu from 12.10 to 13.04 and upgrade my current project from Qt4 to Qt5. The problem is that the Help section provides ...
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163 views

Qt creator: “cannot find -lGl” Cannot install libglu1-mesa-dev

I am trying to compile and run a QT program. I have already tried windows (couldn't get taglib to compile); I also tried OSX, I compiled but the program crashes even though it doesn't crash on my ...
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2answers
2k views

“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 ...
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QT on ubuntu: can not find -lGL [duplicate]

I just installed QT creator from the offline installer. Created a new project and tried building the dummy code (it was supposed to work because itw orked in windows too with msvc installed) Anyway ...
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2answers
1k views

Ubuntu Qmake is not an executable

I have the latest versions of qtcreator, qt5-qmake build-essential and g++ installed. In option of Build & Run and choose qmake in /usr/bin/qmake I get this error: The qmake executable ...
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2answers
78 views

How does one get the ambient light conditions in Ubuntu Touch?

I am planning to make an app which would switch between Light and Dark theme based on the ambient light conditions. So if it was a dark room, then the app would switch to a dark theme to reduce the ...
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1answer
479 views

Qt Installation requirements: unmet dependencies [duplicate]

im a linux beginner and used google & Co. by installing the requirements ( http://doc.qt.io/qt-5/linux.html ) for Qt: sudo apt-get install build-essential libgl1-mesa-dev i get the following ...
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1answer
36 views

How to enable global application menu in RStudio?

On Ubuntu 15.04 Unity, how can I enable the global menu bar for the Qt application RStudio? I found a 12.04 question, which was not solved and did not contain a clue. (Due to reputation issues, I ...
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KDE 4 Strange Problem

A problem with KDE is really driving me crazy, any help would be greatly appreciated. I have a xunbuntu 14.04 on which I installed kde-plasma-desktop. There are very few styles (System settings -> ...
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2answers
94 views

No option for C++ in Qt Creator (for project)

I've installed the Qt 5.4.0 for Linux 64-bit (542 MB) on gnome ubuntu 14.04, When I started new project, I couldn't find the "Qt C++ Application" tab. There is option for C,QT,BLACKBERY....... But no ...
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1answer
211 views

How to install Dropbox on Kubuntu 14.10 with QT problems?

I am unable to install Dropbox on a fresh install of Kubuntu 14.10 (with the new Plasma desktop version). When I attempt to start the dropbox daemon using ~/.dropbox-dist/dropboxd I get an error ...
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16 views

install qtmobility on ubuntu

I couldn't find any good link for downloading qt-mobility packages. and I also couldn't find any good installation guide for this. the most of the links are outdated. Thank you.
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1answer
77 views

Ubuntu SDK: How can I use PyQt for developing Ubuntu Touch apps?

I've heard that it's possible, can you give me some pointers on how to do that?
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2answers
1k views

Can I create a proprietary application using Qt?

I am using Qt4 to build an application and for some reason I want to keep it proprietary. Qt4 is released under LGPL, does that force me to release the code to my application. I ask this question ...
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Installing Qt Creator 3.1.2 on Ubuntu 14.04 LTS

I have found PPA and manual method to install Qt Creator 3.1.2 on Ubuntu 14.04 LTS. Which one is more reliable (has less bugs once installed)? The manual method offers 64 bit installation. What if I ...
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Can I sell my PyQt4-app without having a PyQt license?

I would like to sell a Python application that uses PyQt4. The commercial licenses for Qt PyQt cost thousands of Euros together. Do I need to buy a commercial license? Consider this from a ...
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1answer
43 views

Is there Qt Creator documentation available in a ubuntu or debian package?

From QtCreator, aka the Ubuntu SDK, I can ordinarily access documentation for classes such as QString and all QObjects, however, I can not access the documentation for classes such as: ...
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1answer
267 views

Plotting with Matplotlib in Python 3 pylab: Tkinter and Qt FontManager errors

I'm trying to use pylab (i.e., $ ipython3 --pylab) in Python 3 on Ubuntu 14.04. I'm running into the same error regardless of whether I use the Tkinter or Qt4 backends. AttributeError: 'FontManager' ...
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3answers
4k views

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 ...
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2answers
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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 ...
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2answers
320 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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2answers
4k views

How to add shortcut to unity launcher programmatically?

I'm developing a program in Qt that will help users to manage (create, edit and delete) their quicklists in Unity launcher. I got to a point where I created .desktop file and I don't know how to ...
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2answers
968 views

Qt 5 configuration

I have a problem setting Qt5 apps correctly on my computer. I'm running Ubuntu 14.04 with KDE4, I have configured the look in the KDE system settings and that look is used in every qt4 apps and gtk ...
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3answers
3k views

How to install needed Qt packages to build kernel on 14.04?

I'm going to compile kernel on Ubuntu 14.04 64-bit, so I start with installing packages that I need: sudo apt-get install build-essential bin86 kernel-package libqt3-headers libqt3-mt-dev wget ...
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1answer
324 views

qt can't find GL/gl.h but libGL.so exists

I am running 64 bit Ubuntu 14.04. The compile error I am getting is: In file included from ../../../Qt/5.4/gcc_64/include/QtOpenGL/qgl.h:39:0, from ...
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14 views

PlayonLinux some issues of starting programmes

I am using the latest version of Ubuntu. Today I installed POL and wine. But while I try to install a program, I get the message: This application failed to start because it could not find or load ...
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0answers
187 views

Ubuntu 14.10 xrdp works, but Qt Creator doesn't

I'm running Ubuntu 14.10 x64 and xrdp works perfectly, I'm using the Xfce desktop by the way. Qt Creator works, but when I log in using xrdp Qt Creator doesn't open. So I tried running it from the ...
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1answer
143 views

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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33 views

How to build .deb package with ubuntu-sdk

How can i build a .deb package with ubuntu-sdk? I don't want to publish to the ubuntu software center, only need a .deb package for my Ubuntu-SDK/QT Creator project. Thanks
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1answer
176 views

Having trouble linking QML button to C++ class

First time using Ubuntu SDK and QML. I've spent the entire day attempting to figure this out but every solution that i came accross is either outdated or not well documented. I'm trying to figure out ...
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25 views

Can you use QProcess in a Click Packaged Application?

I am just curious whether this is something AppArmor allows or not? My application works fine on the desktop, but I can't get Standard output or error to even display in my app when I run it from the ...
2
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1answer
913 views

Font rendering problems with QT applications in Xubuntu

I'm currently using Xubuntu 14.04 but the same problem is present in 13.10 and 13.04, and maybe in previous versions. I always install truetype fonts and remove the anti-alias. In all the GTK ...
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1answer
862 views

Qt5 font rendering in Ubuntu 13.04

My fonts in general within QtCreator inside Ubuntu 13.04 looks 'ugly' when compared to how they looked in 12.10. 12.10 still used Qt4, so did something regarding the font rendering in Qt5 and the ...