Questions tagged [qt5]

Qt 5 is the 5th major version of the popular GUI toolkit for implementing graphical applications. This version contains major changes, and Qt Quick is central to it.

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Getting qimage bit information in pyqt5 with numpy

I am using Ubuntu 16.04 LTS operating system. I am writing with qpaint using Format mono format on QImage. After creating the image and taking the object with the numpy.frombuffer, there is no problem ...
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Package 'qt5-default' has no installation candidate

I'm trying to install Geant4 on Ubuntu 20.04 while i use: sudo apt-get install qt5-default ,there is some error as written and shown below. Reading package lists... Done Building dependency ...
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GTK Style selection not available in qt5ct after re-installation 22.04

As per @Archisman Panigrahi advice, I'm posting a new question regarding qt5ct. I've recently reinstall 22.04 and found that the Style drop-down menu only has Fusion and Windows, hence, I am unable to ...
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Can't install qt5-default on Ubuntu 22.04 - required to install IQmol

Installing IQmol is relatively easy (I did it with ubuntu 20.04 without problems). However with Ubuntu 22.04 there is a problem with the qt5-default package that seems to have been updated for this ...
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Could not find a package configuration file provided by "Qt5LinguistTools" despite having qttools5-dev qttools5-dev-tools installed

I am trying to compile something, get this error: Could not find a package configuration file provided by "Qt5LinguistTools" with any of the following names: Qt5LinguistToolsConfig....
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how to upgrade to Qt 5.5.1 [duplicate]

I already have Qt 5.5.0 on my Ubuntu 18.04.6 LTS (32-bit) and want to upgrade it to Qt 5.5.1 (I don't need to install Qt creator necessarily). Can anyone help me to find a proper way? I'm new in Qt.
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Qt5 install problem ubuntustudio 22.04

The short version of the question: where is qt5 installed on Ubuntu Studio 22.04? The long version of the question can be seen unanswered here on the SuperCollider forums: essentially I am trying to ...
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How to solve QT Make File 5 error

My OS is Ubuntu Desktop 18.04. QMake version 3.1 I'm using Qt version 5.9.5 in /usr/lib/aarch64-linux-gnu . When I build the project I get the qt Makefile 5 error. How can I solve this? makefile:248: ...
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2 votes
2 answers
541 views

Unable to change QT_QPA_PLATFORMTHEME environment variable

Xubuntu 20.04 LTS I want to change default XFCE theme for Qt applications. It's set to Fusion style on my app. I read from tutorials that I need kvantum manager and qt5ct I installed both packages ...
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Why does ./configure not find Qt5? Needed for building phonesim from source

Background: I'm trying to build and install ofono-phonesim from source, on Ubuntu 20.04 aarch64, so I can get HFP to work with Pulseaudio 13.99. I'm doing this because of the following: This answer ...
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Qt5.15 FileDialog not working well in Flatpak

I'm using QtQuick 5.15 and I'm implementing a file dialog with FileDialog in my QML file. It works well outside the sandbox, but it is not working in the the sandbox. The file I choose is not passed ...
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Why is my webcam not recognized by QCameraInfo in Qt5 on Ubuntu 20.04?

I want to list my available webcams using this function included in the QCameraInfo class in Qt 5, but when I check the returned list, I see that it's empty showing there's no webcam working on my ...
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How do I install an ubuntu package from an older release?

I'd like to install libqt5qmlmodels5 from packages.ubuntu.com. The library exists in [universe] for [groovy] [hirsute] [impish]. I'm on Ubuntu 20.04.2 LTS [focal], so apt install doesn't work. Can I ...
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gnuplot Qt5 install FAIL

I'm running 20.04 but after several tries I can not get gunplot to install properly wiht qt5. I followed the instructions from another Q/A: sudo apt install qtbase5-dev qtbase5-dev-tools libqt5svg5-...
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2 votes
2 answers
347 views

Cant open qt based applications

cant open qt based applications such as qbittorrent, nomacs, etc . Getting error: nomacs: error while loading shared libraries: libicui18n.so.56: cannot open shared object file: No such file or ...
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QtCore could not be found by catkin_make a SpotMicro(robot-dog)

Anyone met a problem when compiling a spot micro there is an error "reported QT_INSTALL_LIBS as "/usr/lib/aarch64-linux-gnu" but qtcore could not be found there. QT is NOT installed ...
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.profile suddenly doesn't like comments [duplicate]

I'm running Xubuntu 20.10 on a MBA 2012. I wanted to use my GTK theme on a QT program, so I did a little searching and ended up with adding export QT_QPA_PLATFORMTHEME=gtk2 to my ~/.profile. That ...
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7 votes
3 answers
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Okular does not respond anymore, needs Qt_5.15

I have Ubuntu 20.04 running on my system and was using the pdf-viewer Okular until recently. However, now Okular does not start when double clicking on a pdf-file and starting from the terminal gives ...
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1 vote
1 answer
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How do I download qt5-default for Ubuntu 20.04 LTS?

I need an easy explanation because I am very new to Linux and I want to use an app that makes use of qt5 as requested by their website.
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Is it possible to install latest version of RaySession on Ubuntu MATE 20.04 LTS?

I'm testing RaySession application. I have started with its version from official repository. But it seems to be outdated. So I decided to get latest master from GitHub project page https://github.com/...
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qt3dwindow.h missing in focal and xenial

The way dev package for Qt are designed in ubuntu is extremly disturbing to me. Lets take a simple example, QForwardRenderer include file for instance: It is part of bionic: https://packages.ubuntu....
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4 votes
1 answer
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How do I open .qch files?

I've installed the qt5-doc package but I'm not able to open the .qch files that I find in the /usr/share/qt5/doc/ directory. Do you know how I can do this? I've tried using qt5-assistant like this: ...
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3 answers
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Official .deb WPS Office very slow in opening file - snap version fixes the problem - Why?

I have installed WPS Office ver. 11.1.0.9719 from official website and official .deb x86_64 package. This version of WPS Office is very slow in opening some files. For example, I have this .docx file ...
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1 vote
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Error while running Qt application with wayland

I am trying to run a simple Qt application Hello World on Ubuntu 18.04 desktop with Wayland. Following commands, I tried. $ export QT_QPA_PLATFORM=wayland $ ./qello also tried with following command $ ...
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Install/upgdate to Qt 5.15 from PPA on 18.04.5 LTS (Bionic)

I'd like to install Qt 5.15 from this PPA (I don't want to use the installer). I've added the PPA but I cannot find an apt get command that installs the all the packages in the right order i.e. sudo ...
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Viber not starting on Xubuntu 16.04

After installing viber (version 13.3.1) from official debian package viber won't start normally. Viber is installed using dpkg command: $ dpkg -i viber.deb When viber is started, main window is not ...
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2 answers
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How to update qt version to 5.15.1

i have on kubuntu qt version to 5.12.8, and i need to update it to 5.15.1 i tried to manually install it..the installation folder installs it in /home/Qt. but when i check the qt version is still 5.12....
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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found

I am trying to plot something on gnuplot using Mobaxterm for windows subsytem for Linux. I installed QT packages and gnuplot etc and was able to successfully plot what i wanted. After i shut down my ...
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1 answer
543 views

Lyx isn't working (probably related to Qt5)

Lyx won't launch. The only error message it gives me is: lyx: symbol lookup error: lyx: undefined symbol: _ZN17QAbstractItemView11eventFilterEP7QObjectP6QEvent, version Qt_5 Lyx has been taking my ...
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Qt error when trying to use GPU rendering for a robotics simulator on headless machine

I'm trying to get a robotics simulator (https://github.com/stepjam/PyRep) working on a remote headless machine with GPU rendering. I've followed the installation instructions, and can run an example ...
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0 votes
1 answer
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i have downloaded qt-everywhere-src-5.15.0 how to install or use it [duplicate]

This downloaded file is in my download folder. Where should I keep this folder and how to use and install it? Previously I deleted all qt5 files show there is an error so I have downloaded it. I have ...
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2 votes
1 answer
292 views

How to install "libqt5webview5-dev" on Ubuntu 16.04 LTS?

I'm not an expert, I'm on Ubuntu 16.04 LTS, and I'm trying to install Stremio by following this tutorial "https://github.com/Stremio/stremio-shell/blob/master/DEBIAN.md" from source codes. ...
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How to remove Clementine alternate list background colors? (Qt5)

Like Dolphin, Clementine usually has alternating background colors in lists that look like this in the track view frame: I would like to remove those alternating colors to have a clear view of the ...
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2 votes
0 answers
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Avogardo requires Qt4 on Ubuntu 20.04

I would be very happy about your help. I have the following problem, I absolutely need avogardo 1.2 for my research. however, I did an ubuntu update without thinking the problems started. ubuntu 20....
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PyQt5 QtMultimedia shows black screen on playing H.264 video

We are using a tool based on PyQt5 for some video processing. Since a few days some users complain, that the tool shows only a black screen instead of a video. Sound is still working. We were able to ...
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22 votes
3 answers
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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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3 votes
1 answer
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Qt apps are very slow to load in Xubuntu 20.04 when export QT_QPA_PLATFORMTHEME=gtk2 is enabled

I have installed qt5ct to apply gtk2 theme on Qt apps (by default they follow the Fusion theme). However, Qt apps (I have tried GNU Octave and Brightness Controller) are taking too much time to start ...
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2 votes
1 answer
541 views

Is there a lightweight photo viewer made with Qt?

While the default photo viewer Gwenview is very good, it is also a file manager and has many other features. As a result it is not very lightweight. Is there a very lightweight photo viewer (that ...
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1 vote
1 answer
2k 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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896 views

Qt plugin error at application startup Ubuntu 20.04

Good day. When starting a new application (the installation was successful without any errors) on Ubuntu 20.04, the program starts with an error - ~$ openscada 2020-04-19T00:58:25 1[/] Primary ...
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1 vote
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Couldn't find any package whose name or description matched "libqt5ftp5-dev"

I use following command to install packages on UBUNTU1804. sudo aptitude -R -y --allow-untrusted install libqt5ftp5-dev Error: Couldn't find any package whose name or description matched "libqt5ftp5-...
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2 votes
1 answer
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How can I fix "libQt5XcbQpa.so.5: undefined symbol: FT_Get_Font_Format" when I'm already using freetype 2.9?

I finally upgraded from 16.04 to 18.04. Teamviewer was working just fine in 16.04. After the upgrade when I try to launch the GUI it gives me: /opt/teamviewer/tv_bin/TeamViewer: symbol lookup error: /...
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2 votes
1 answer
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Error with shared libraries running Salome-Meca

Recently, I installed the latest version of the salome-meca software, obtained from here: https://www.code-aster.org/spip.php?article303 After installed it, I try to run it going into the folder ~/...
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3 votes
1 answer
2k views

What is "'gtk2' Qt style" in Lubuntu 19.10?

OS: Lubuntu 19.10 I have a need for my applications to be entirely dark-themed. Lubuntu 19.10 comes with Adwaita-dark (and Adwaita) for GTK2/3 applications. I've also added the materia-gtk-theme ...
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1 vote
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Where is the Ubuntu `*.deb` repository for `qtfm`?

I would like to try the qtfm file browser but [https://www.qftm.org] has vanished. Does anybody know of a .deb repository from which to install qtfm? Can it be installed from source code: $ ./...
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2 votes
1 answer
165 views

Dead keys (accents etc) not working since LibreOffice 6.2 (since Ubuntu/Kubuntu 19.04 "disco")

After updating to LibreOffice 6.2 keyboard input of non English symbols is either ignored or leads to random behavior (for instance the cursor jumps to the end of the line).
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4 votes
1 answer
494 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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2 votes
1 answer
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play audio via libqt5multimedia5 without pulseaudio

I have Ubuntu 18.04 installed and would like to use https://gitlab.com/gillesdegottex/dfasma for audio analysis. dfasma links with libQt5Multimedia.so.5 for audio playback. Initially I had the ...
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3 votes
1 answer
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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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1 vote
0 answers
625 views

Trying to run QT 5 Designer on Ubuntu (Budgie) 18.04 with python 3

I have been able to run the QT 5 Designer app from the memnu untill recently. Trying to run from the terminal I get error as below It has to do with the libqscintillaplugin.so plugin. The file is ...
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