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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Downgrading QT to mainstream version

I need to downgrade my QT from version 5.6.1 to 5.5.1. (The reason being that compilation fails for several software packages, requiring exactly version 5.5.1.) However, I cannot seem to do that, ...
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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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914 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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Qt apps follow different themes when called from terminal and when run from menu

I am using cleanlooks theme in qt5ct, and qt apps are following this theme when called from terminal. However, they are following gtk2 theme when run from Menu. I have checked this for GNU Octave and ...
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1answer
142 views

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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43 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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1answer
450 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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117 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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1answer
80 views

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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40 views

Qt5.4: libQt5.4OpenGL.so.5.4.2 error adding symbols: File in wrong format

I am building a cpp based codebase (COLMAP: https://github.com/colmap/colmap) using cmake build system. When I run the make command, I get the following error: Qt/5.4/gcc/lib/libQt5OpenGL.so.5.4.2: ...
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1answer
195 views

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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36 views

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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135 views

PySide2 installed with pip3 does not follow system theme in KDE

I have written some software in PySide2 (I installed PySide2 using pip), but it does not follow system theme in KDE. In XFCE, I can install qt5ct to change the theme of programs written in qt5, but in ...
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1answer
425 views

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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1answer
854 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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102 views

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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1answer
60 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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1answer
151 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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1answer
222 views

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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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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46 views

18.04 Qt5 Updates yesterday

I have some updates of qt5 packages yesterday, and they seem to be causing a segfault on a self compiled binary, does anyone know what these updates were for, i dont see any available downgrades in ...
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231 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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32 views

how do I change my default display gui with Qt gui at time of booting on linux

I have already made Qt GUI application, I want to run that application at the time of Linux booting. In simple meaning when I power on my Ubuntu I don't want that default desktop I want my Qt ...
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26 views

TeamViewer install borked, can't seem to fix [duplicate]

Xubuntu 18.10 So the other day I went to run TeamViewer and found it was gone. So I tried to re-install it and this happens: $ sudo apt install teamviewer Reading package lists... Done Building ...
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1answer
88 views

How to change theme in Qt5 configuration editor when it is too large

I changed theme in Qt5 configuration editor (qt5ct package) and now it is so big that it cannot be resized and the apply button is outside the laptop screen. How to change the theme to gtk2 ? Is ...
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1answer
166 views

Change the Lib request of an executable file

I am currently using a program which called " Write " created by Stylus Labs. It is a single file application which uses the QT5.7 libs. It running on my Laptop with Ubuntu 16.04 x64 Bit. Actually ...
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1answer
17k views

How the heck can I install Qt5 on Ubuntu 16.04 LTS?

I have loads of programs that require Qt4 and I need to install programs that require Qt5. When I try to install Qt5 things start off dodgy and then proceed to insanity. I request friendly guidance. ...
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61 views

Ubuntu 18.04 - move QT5 application to left or right

Most of the applications I use in Ubuntu 18.04 respond to super+Left Arrow or super+Right Arrow to place the window on the left or right side, as explained in Ubuntu 18.04 - move a window left-right ...
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1answer
896 views

QtLocation and QtPositioning not installed

I'm trying to develop a KDE widget that should display a map. At the moment I can't get the widget to load, because of the errors module "QtLocation" is not installed and module "QtPositioning" is not ...
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1answer
3k views

Suddenly Okular will not open any more

I have made my laptop double boot a few months again, with Ubuntu 18.04.1 . I have been working with okular to open pdf files (for the commenting option) but suddenly okular doesn't work anymore. When ...
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1answer
2k views

Can't launch Qt Creator in Ubuntu 18.04

My environment initially had qt4 and Qt Creator seemed to work fine back then. I installed qt5 and after that Qt Creator does not launch anymore. Qt Creator works fine in my virtual machine however. ...
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1answer
137 views

Is there qt5-widget-factory just like gtk3-widget-factory?

There is a very useful tool named gtk3-widget-factory in gtk3-devel package. Is there similar tool in Qt5 ?
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1answer
598 views

Minimal Qt5 install to compile code

I wrote a little program in C++ using Qt. Back when it was Qt4, in order for my friends to compile my program on their Ubuntu system, I would tell them, after getting my source files, to just run: ...
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1answer
2k views

Qt 5.11.2 in Ubuntu 18.10?

Probably nobody can give me a definite answer, but does anybody if we are going to see qt5-default 5.11.2 in the official repositories of Ubuntu 18.10 at some point?
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46 views

How are Qt modules/classes distributed amongst Ubuntu packages?

For example, I know that I need the core dependency or the network one. In other words I have the following lines in qbs project file Depends { name: "Qt.core" } Depends { name: "Qt.network" } Now, ...
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1answer
534 views

Relocation error libqt5 and libpng16

I have recently upgraded from 16.04 to 18.04 While trying to start qjack I get this error qjackctl: relocation error: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5: symbol png_set_option version PNG16_0 ...
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2answers
154 views

Qt5 installation default host unreachable

I got a really annoying error when I want to install Qt5 on Ubuntu 16.04 LTS Network error while downloading 'http://mirrors.ukfast.co.uk/sites/qt.io/online/qtsdkrepository/linux_x64/desktop/licenses/...
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2answers
815 views

Unable to install qt511-meta-full from PPA:beineri on Ubuntu 16.04: qt511doc package does not exist

After adding this PPA for Ubuntu Xenial (16.04) to install qt5.11: https://launchpad.net/~beineri/+archive/ubuntu/opt-qt-5.11.0-xenial and updating with apt-get, I encountered this issue while trying ...
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1answer
470 views

teamviewer 13 crashing on UBUNTU 16.04

I am getting the crash in Teamviewer 13 as follows now i have followed uninstalling the software ,removing the configuration files but it still doesn't works any idea would really help.I have also ...
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651 views

How to force a qt version to be installed

After the last qt update, I have a conflict between my qt versions. A part of the qt libraries come from ubuntu Xenial repo and the other part from neon Xenial repo. I cannot start kde anymore due to ...
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0answers
223 views

Qt Designer is buggy

I installed QT 5.11.0 on Ubuntu 17.10. I launched Qt Designer with ~/Qt/5.11.0/gcc_64/bin/designer. However, I cannot maximize the Designer window, I cannot drag and drop widgets, widgets change ...
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0answers
487 views

VirtualBox not starting: libQt5Core.so.5: cannot open shared object file: No such file or directory [duplicate]

This is a fresh install of Ubuntu 18.04 using default gnome desktop. When I try to launch VirtualBox it does not load. When I run it from the terminal I get an error message: VirtualBox: ...
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3answers
26k views

Ubuntu 18.4 libQt5Core.so.5: cannot open shared object file: No such file or directory

I have Ubuntu 18.04. While launching virtual box I am getting an error $ virtualbox VirtualBox: supR3HardenedMainGetTrustedMain: dlopen("/usr/lib/virtualbox/VirtualBox.so",) failed: libQt5Core.so.5: ...
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2answers
2k views

Can't find what package to install to get a proper Qtmultmedia gstreamer backend

In a new shiny ubuntu 18.04, I am trying to use a python3/pyqt5 script that use QtMultimedia. It was working fine in 17.10. And now even after installing a bunch of package, I still can't get it to ...
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0answers
254 views

How can I change vlc tooltip font size?

When I mouse over the time bar in VLC, a tooltip is displayed indicating the hovered over video time. For me, this tooltip is very small, and hard to view unless moving closer to the screen. ...
2
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1answer
3k views

ODA Drawings Explorer (formerly Teigha Viewer) for DWG files. How to install and make it work properly?

ODA Drawings Explorer (formerly Teigha Viewer) is a free (not libre) viewer for proprietary DWG files, developed by Open Design Alliance. The developing company provides RPM and DEB packages for easy ...
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0answers
567 views

Vlc Does not start

so I am running into a lot of problems with vlc these days. I had removed qt5 to solve the trimming error but ended up destroying the Vlc build. now when I click vlc icon it doesn't do anything ...
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2answers
1k views

Libqt 5 based applications have big icons and fonts and scaling issues

Since I updated to QT 5 (Ubuntu 16.04), all applications (VLC, TexStudio, Texmaker ...) that apparently use QT5 have problems scaling, and every time I disconnect my laptop from the external screen , ...
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1answer
214 views

Search fields respond slowly to input on Plasma KDE desktop

I'm on a upgraded version of Kubuntu, from 16.04 to 17.04 and then to 17.10. When trying to type something in krunner or in a search field of the application menu - the letters just don't appear as ...
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1answer
908 views

Install Qt5 on Virtualbox, get segmentation fault

I have virtualbox(5.2.2) created from ubuntu-16.04.3-desktop-amd64.iso, on Windows host. I downloaded qt-opensource-linux-x64-5.9.3.run, when I run it, get: # ./qt-opensource-linux-x64-5.6.3.run ...