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.

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How to exclude package from apt --fix-broken install (Don't tag it as a duplicate)

My last post tagged as duplicate, and I don't know how to delete that duplicate mark. If you think this is duplicate or already answered please comment first, don't immediately mark as duplicate. ...
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Style/appearance menu is missing in systemsttings5 after ugrade from 19.10 to 20.04

The KDE application under gnome is normally missing some icons and the font size looks strange too. Normally, I followed this to set the fallback of icons. However, after upgrade from 19.10 to 20.04 ...
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1answer
41 views

Zeal Not working after ubuntu upgraded from 19.10 to 20.04

Some days ago I upgraded Ubuntu from 19.10 to 20.04. After upgrading all things work fine except Zeal documentation browser. I clearly says that to update qt5. But I don't know how to update it. The ...
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70 views

How to exclude package from apt --fix-broken install [duplicate]

Package packettracer is refer to Cisco Packet Tracer 7.3. My OS is ubuntu 20.04. I have a package packettracer that not clearly installed, but the package is working. $sudo dpkg -i ...
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Looking for qt-at-spi for ubuntu 20.04

Package packettracer is refer to Cisco Packet Tracer 7.3. My OS is ubuntu 20.04. I installed the packettracer, the package is required qt-at-spi package that I could not found on ubuntu 20.04 ...
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ODA File Converter don't work on latest Ubuntu 20.04

I currently on latest Pop! OS 20.04 which based on current latest Ubuntu, and I tried to install ODA File Converter so I can import DWG file to FreeCAD. I download the deb file at https://www....
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1answer
87 views

The pcmanfm-qt is dead on my Lubuntu 20.04

I know it is so weird, but last night I set an image on my desktop background and delete the image, then I right-click on the desktop and press the desktop properties to change the style of background ...
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1answer
29 views

Project ERROR: Unknown module(s) in QT: script

So I've recently done a (fresh) installation of Ubuntu 20.04 LTS and I'm trying to install IBOview, which I had working on 18.04 LTS. As it describes in the README, and as I successfully did before, I ...
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815 views

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 ...
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Linux packages install via Terminal error (unmet dependencies)

I tried to install a new Point Cloud Library but got this error install error I also tried to install them separately with: # sudo apt install libboost-all-dev libvtk6-dev libvtk6-qt-dev just got ...
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1answer
203 views

epson-printer-utility error loading shared libraries

When trying to run the printer utility I downloaded from Epson website I get the following error: epson-printer-utility: error while loading shared libraries: libQtCore.so.4: cannot open shared ...
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2answers
177 views

QtCreator not recognizing linked libraries after upgrading Ubuntu to 20.04

I've upgraded from Ubuntu 18.04 to 20.04 and besides some nasty grub issues most things worked out of the box. But my QtCreator (Qt Creator 4.11.0, Based on Qt 5.12.8 (GCC 9.3.0, 64 bit)) is facing ...
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1answer
424 views

Stuck without Qt4 in Ubuntu 20.04

I just upgraded to Ubuntu Focal Fossa and found that the lack of Qt4 means it isnt possible to build antimicro I noticed this post saying it would work with libqt4-dev, and I'm sure would as it ...
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24 views

Run debug with sudo permission using qt creator

I want to debug my app at terminal with sudo permission. I tried to change the terminal settings to /usr/bin/xterm -e sudo and /usr/bin/gnome-terminal -x sudo, but it is just open empty terminal and ...
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Scrollbar width in Qt applications

I have made the scrollbar width for Gtk applications wider, Create a file called ~/.config/gtk-3.0/gtk.css Containing scrollbar slider { /* size of the slider / min-width: 20px; min-height: ...
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81 views

Cannot open qcreator qt.qpa.plugin: Could not find the Qt platform plugin “xcb” in “”

I am on Ubuntu. When I type qtcreator on terminal, I get: QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/plugins/platforms" ... QFactoryLoader::QFactoryLoader() looking at "/usr/...
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1answer
30 views

configure can't find QT path

trying to compile the 'quiteinsane' GIMP plugin, on Ubuntu 18.04 bionic. When running configure, it complains that "checking for Qt... configure: error: Qt (>= Qt 2.2.2) (headers and libraries) not ...
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QT 5 UI language and local settings

I'm on Kubuntu 19.10 I have set Regional Settings > Language > British English (Configure Plasma translation) but as I'm living in another country I must set Regional Settings > Formats > Other ...
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27 views

Cannot view dicom images in Ubuntu using QT

I have created GUI to load Dicom images using VTK and QT. Using Qt, dicom images should be loaded and seen in Qt widget. I have checked my code in windows and its working fine (I can view dicom image ...
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32 views

dark icon for QT Apps in Xubuntu using mint-y theme

I'm using Xubuntu 18.04.4 LTS, here is details of my installation : The Mint theme is working perfectly for GTK application, but in QT application I see dark icons , for example this is how ...
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1answer
169 views

Creating a virtual display on Ubuntu Server

I have an Ubuntu Server (18.04.4) VM, with a FreeNAS machine running bhyve as the host for virtualization. I am building a service to headlessly save web pages to PDF using wkhtmltopdf. When invoking ...
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233 views

QSqlDatabase: QMYSQL driver not loaded

I lost a lot of time to solve the problem of connection with my database in Qt5 program,the OS is Ubuntu-18.04 , please help me I have the error: QSqlDatabase: QMYSQL driver not loaded QSqlDatabase: ...
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qt-opensource-linux .run seg fault on ubuntu 18.04 vm

I'm trying to install qt 5.11 on a virtual machine running ubuntu 18.04 The qt-opensource-linux.*.run packages crash when executed. Below is the output of uname, and the installer with the -v option. ...
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1answer
1k views

Difference between desktops (lubuntu) qt, gtk? [duplicate]

Upon installing Ubuntu, I get to choose what more to install, but what's the difference between: Lubuntu minimal installation Lubuntu desktop Lubuntu minimal installation GTK part ...
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1answer
128 views

incompatible qt lib when running packettracer

I am trying to install packettracer on ubuntu 18.04,When I click on the Icon nothing was happening so I ran from shell and gave me ./PacketTracer7: error while loading shared libraries: ...
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400 views

Install Qt > 5.10 on ubuntu 18.04 in order to build the minitube 3.2

For building the minitube ( https://github.com/flaviotordini/minitube ) I need to have a version later than the one offered by the repositories. The reason I am asking is because the developer ...
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1answer
2k views

How to install qt5-default?

I would like to install "qt5-default" on Ubuntu 19.04 starting with sudo apt-get install qt5-default I get "qt5-default : Depends: qtbase5-dev but it is not going to be installed" on sudo apt-...
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1answer
42 views

Cannot open Virtual Box 6.0 after an interrupted update

I accidentally interrupted the Virtual Box 6.0 update that was installed and working correctly on my Ubuntu 18.04. After that, Virtual Box does not open. Running virtualbox through the terminal throws ...
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1answer
832 views

Why does forcing Qt applications to use GTK theme makes those apps startup slowly?

I noticed whenever I force qt applications to use any GTK theme on Ubuntu 19.10 by adding the line export QT_QPA_PLATFORMTHEME=gtk2 to .profile, the startup time goes from 1-3 seconds to 20+ seconds ...
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65 views

mouse hover acts as click in qt application in ubuntu 18.04

Seems to be after a lid opening when i unplugged the DELL dock WD15 and closing the lid in the mean while (leaving my desk by example) that mainly QT apps (not all apps such as Firefox/Terminal etc. ...
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650 views

Struggling to build Qt due to missing OpenGL libraries

I'm trying to build an executable Qt-based program for Linux, and link Qt statically in the binary. According to the Qt docs, to do this I'm going to need to build Qt from source, starting with the ...
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148 views

Japanese input stopped working for QT applications in 18.04

I'm using Anki to create flash cards for Japanese words. It worked last time I've checked, but now it doesn't even if I set input mode to hiragana. I've followed instructions in this question, but to ...
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1answer
95 views

Accidentally deleted a dependency file. What do I do now? [closed]

I was recently debugging qt installed on the latest ubuntu and during by debugging efforts I accidentally deleted qt5widgets.so . Now, I have no idea to how to recover it as I already re installed qt, ...
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656 views

Installing QT Error on ubuntu 18.04

I tried to install QT on ubuntu using : sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler but I got this : Reading package ...
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1answer
557 views

How to fix “no backend found for spell checking” in Kate editor settings?

I have installed Kate editor into my Ubuntu MATE 16.04.6 LTS system as simple as sudo apt-get install kate . In its Settings → Configure Kate, Editor Component, Editing, Spellcheck tab I see that it ...
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283 views

Qt 4.8.7 - Cross compilation error - symbol lookup error: undefined symbol: _ZN7QWidget8qwsEventEP8QWSEvent

I have cross compiled executable file from QT 4.8.7 and i am running it on Raspberry PI(Ubuntu OS installed in it) which have installed QT 4.8.7 and QT declarative module also. When i run the cross ...
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2answers
1k views

Ubuntu 18.04: “Add to Favorites” missing for certain qt-based applications?

OS: Ubuntu 18.04 (minimal installation option): dkb@dkb-ubu1804:~$ cat /etc/X11/default-display-manager /usr/sbin/gdm3 dkb@dkb-ubu1804:~$ echo $XDG_SESSION_TYPE x11 dkb@dkb-ubu1804:~$ I installed ...
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132 views

Shortcut to Qt application in ubuntu 18.04

I'm using linuxdeployqt to deploy my Qt application, which works fine. The application starts as expected when running it directly from the folder where all files are placed (/opt/MyApp/). ...
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1answer
148 views

How do I discover my current system encoding?

In QtCreator, they have something that looks like this: I changed the defualt encodring setting in an attempt to get my ide to display emojis, and now my system is really acting up. Including web ...
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128 views

caja and QT applications - how to set QT_SCALE_FACTOR

On this system (19.04 MATE with latest NVIDIA) QT applications play with oversized menus and window decorations. To correct I set QT_SCALE_FACTOR=1 into my .bashrc and this works when I call up an ...
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116 views

DISPLAY variable changed after restart for remote debugging

I am trying to remotely debug a Qt application. Yesterday everything was fine. the result of echo $DISPLAY was something like localhost:10 and I could see the remote application window in my local ...
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334 views

Installing QtWebengineView on Ubuntu: “A suitable version of dbus could not be found. QtWebEngine will not be built.”

I am trying to install QtWebEngineView on ubuntu with the proprietary codecs. Running: ➜ qtwebengine git:(c3c37b4e) ✗ /usr/local/Qt-5.12.1/bin/qmake -r -Wall -- -proprietary-codecs -ffmpeg ...
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126 views

Makefile:9155: recipe for target 'install-gdb' failed

while installing gdb-source archive files (from http://ftp.gnu.org/gnu/gdb/) i am getting the following error(Makefile:9155: recipe for target 'install-gdb' failed).please explain me clearly and if ...
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1answer
575 views

Non-gtk desktop programs on Xubuntu 18.04 look terrible

I've been using xubuntu for the past few months and have been continuously struggling to understand why almost every time i install a new program, it looks like something from windows 95: I included ...
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0answers
2k views

qt.qpa.screen: QXcbConnection: Could not connect to display

I have this problem where i can't run a snap app my system is a dualbooted DELL Latitude E7450, 8 GB ram, 2.5 GHz Intel i5, 250 GB SSD, running Zorin core 15 (170 GB) and windows 10 (80 GB) my ...
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32 views

How do i enable QT declarative module & script module in Ubuntu while installing QT 4.8?

I want to enable QT declarative module and script module while installing QT 4.8 through the following link : "How to install Qt verion 4.8.1 in Kubuntu 14.04". I am using Ubuntu 14.04. please help :)
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1answer
120 views

Where is .deb file created after running the command sudo make install in qt 4.8 installation process in Ubuntu?

Please refer to this link How to install Qt version 4.8.1 in Kubuntu 14.04. I have run ./configure make sudo make install Where is .deb file created after run the command sudo make install in qt 4....
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1answer
1k views

Cant find Qt5Designer, qt5svg and qt5x11extras

I'm trying to install KLatexFormula and it's cmake script is giving the error that it cant find the package config files Qt5DesignerConfig.cmake and qt5designer-config.cmake. Cmake asked me to add ...
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1answer
174 views

libqt5gamepad5-dev not available in 18.04 repos?

I'm trying to install this according to this guide, but when I go to install libqt5gamepad5-dev, I get "Package not found". I've sudo apt update'd multiple times to no avail. How do I fix this problem?...
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1answer
89 views

19.04 MATE and QT : oversized display, low resolution

MATE 19.04. I have two QT applications -- VirtualBox Manager and QT pass. These applications display in very low resolution on one of my machines. The VBox Manager fills the screen so that the dialog ...

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