Qt is an application framework originally created by Trolltech and currently managed by Digia. The KDE desktop uses the Qt framework for its applications.

learn more… | top users | synonyms

0
votes
0answers
13 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 ...
0
votes
0answers
14 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 ...
0
votes
2answers
34 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 ...
1
vote
1answer
21 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?) ...
0
votes
0answers
27 views

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 ...
0
votes
0answers
27 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.
0
votes
1answer
33 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. ...
0
votes
1answer
618 views

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.
0
votes
0answers
25 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 ...
0
votes
0answers
57 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 ...
0
votes
1answer
24 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 ?
0
votes
1answer
62 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?
0
votes
1answer
55 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 ...
0
votes
1answer
66 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
0
votes
0answers
75 views

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 ...
1
vote
0answers
68 views

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: ...
0
votes
0answers
15 views

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 ...
3
votes
0answers
46 views

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 ...
1
vote
0answers
49 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 ...
1
vote
1answer
88 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 ...
0
votes
0answers
54 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 ...
0
votes
0answers
48 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. ...
0
votes
0answers
78 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 ...
0
votes
0answers
69 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 ...
0
votes
0answers
68 views

Undefined reference - fftw

I have a problem with compiling my code and I get the following error: /home/maxfkira/Demo/lib/libdemo.a(TracHold.o): In function 'exitTrac::extAL()': TracHold.cpp: (.text+0x1b): undefined reference ...
0
votes
1answer
216 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) ...
0
votes
0answers
27 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 ...
0
votes
0answers
54 views

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 ...
0
votes
1answer
54 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 ...
1
vote
1answer
60 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
votes
0answers
144 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 ...
0
votes
0answers
29 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 ...
1
vote
0answers
27 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 ...
0
votes
1answer
190 views

Problems with qt library after update to ubuntu 15.10 from 15.04

After updating the os, some programs like vlc and texmaker don't work anymore. texmaker gives me following error: texmaker: symbol lookup error: /usr/lib/x86_64-linux-gnu/libpoppler-qt5.so.1: ...
1
vote
1answer
226 views

QtCreator how to install “Uncrustify” C++ Beautifer?

QtCreator (3.0.1, Ubuntu 14.04 LTS) allows the installation of C++ code Beautifier "Uncrustify", for reformatting existing code. This all looks simple from instructions ...
0
votes
0answers
111 views

KF5ServiceConfig.cmake not found when building Shashlik on Ubuntu 14.04 LTS

I cloned all the sources here except for installing dependencies (because the instructions are for OpenSUSE). I only installed QT5 , QT CMake and Extra CMake Modules. But when I run cmake .. ...
-1
votes
2answers
115 views

Is it bad to have Qt apps on a GTK evironment? [closed]

I'm using Xubuntu 14.04, it has XFCE environment, GTK3 engine and themes, and all my apps use GTK. But I would like to use a particular program (spyder) that demands Qt. Is it bad to have Qt apps on a ...
0
votes
1answer
101 views

How to remove a specific package from dependency list of another package?

Since I'm using Qt5 I want to uninstall all the qt4 libs. I tried it with the following command sudo apt-get remove libqt4-* which attempts to remove all the qt4 libs but in addition it wants to ...
0
votes
0answers
16 views

data is missing while writing into a file in Ubuntu

I am using UBUNTU 14.04 LTS. I am coding GUI program with QT creator,for MIL-STD-1553 communication.I am saving the Data what ever sending the data to RT(Remote terminal)from BC(bus controller) in a ...
0
votes
2answers
344 views

Where (directory) to install Qt?

I am mainly a Windows user, but need to install Qt/QtC for testing purposes under Ubuntu 14. After downloading the installer (as described here: https://wiki.qt.io/Install_Qt_5_on_Ubuntu ) it wants ...
0
votes
0answers
36 views

Use Program made in qt to run on linux instead of windows

I have a program that is distributed for both Windows and Mac. Earlier I found out that it is made using qt creator. Is it possible to somehow use qt to make the program run on linux without using ...
3
votes
1answer
101 views

Application (Qt Creator) is unresponsive on launch, even after reinstalling

When I try to open Qt Creator, it loads fine but after a couple of seconds, the application window becomes unresponsive and turns gray. I can move the window around, but cannot interact with it. It ...
1
vote
1answer
103 views

lots of symbol lookup errors in dynamically linked libraries

I'm using Ubuntu 15.10 Problem: For some days now I have been getting Errors like this when opening some applications: /usr/lib/x86_64-linux-gnu/libpoppler-qt5.so.1: undefined symbol: ...
2
votes
0answers
103 views

QtCreator scrolling bug

I've already asked on the Qt forum, but apparently Ubuntu users aren't there. Steps to reproduce: Place the cursor somewhere. Scroll down with a mouse wheel so the cursor is not in sight any more. ...
0
votes
1answer
54 views

How to get the name of connected ios phone in Linux using command

How to get the name of connected ios device name in Linux, or c++ programming. basically, I use the Qt in Linux. and I want to get the name of the connected device name. after a searching in google we ...
0
votes
0answers
44 views

Can't change version of Qt

I am trying to use Qt5.4, but when I write in console qmake --version only appears: Using Qt version 5.2.1 in /usr/lib/x86_64-linux-gnu I already install Qt 5.4, in another folder, but ...
0
votes
2answers
333 views

How to add element for QML ListModel using Javascript?

I have created one nested ListModel. ListModel { id: mainModel ListElement { mainName: "Alphabet" subAlpha: [ ListElement { alphaName: "A" }, ...
0
votes
0answers
101 views

Ampps warning Cannot mix incompatible Qt library (version 0x40806) with this library (version 0x40805) on kubuntu

I installed ampps in kubuntu 64 bit. When I tried to start ampps by sudo ./Ampps, I got the following error Cannot mix incompatible Qt library (version 0x40806) with this library (version 0x40805)
1
vote
1answer
2k views

Installing Qt 5.5.1 on Ubuntu 14.04 - throws qt.network.ssl error on terminal

I am planning to install qt 5.5.1 on my ubuntu 14.04 running on virtual machine. I have downloaded the installer from qt-io and when I try to install the setup, I notice the below warning on my ...
3
votes
1answer
100 views

Add image files in Ubuntu QML app with C++ plugins (qrc)

I'm writing an Ubuntu QML (phone) App with C++ plugins using ubuntu-sdk. My app includes a png image and in order to include the image in the binary (so it shows on the phone) I have created a qrc ...